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1.
Res Q Exerc Sport ; : 1-10, 2024 Feb 08.
Article En | MEDLINE | ID: mdl-38329500

Setbacks are common occurrences in sport. Recently, setbacks such as injuries and deselection have been accompanied, and confounded, by setbacks related to COVID-19. How students manage a setback may depend on the interaction of two control beliefs: primary control (PC) to directly influence the setback and secondary control (SC) to adjust to it. Purpose: This study investigates the relationships between athletes' PC and SC and two important sport setback-related outcomes-anxiety and rumination. Method: We employed a cross-sectional design examining collegiate athletes in the USA and Canada (N = 200; Mage = 20.9 years, 143 women, 52 men, 3 non-binary, 2 did not disclose). Using regression tests controlling for setback severity, we examined the interaction effects of athletes' PC and SC beliefs relative to setbacks, on the anxiety and rumination variables. Results: We found SC beliefs were beneficial to setback-related anxiety and rumination. A significant interaction indicated that particularly when PC was low, SC had negative associations with setback-related anxieties about letting others down (ß = -.45, p < .001) and experiencing pain (ß = -.37, p < .001). Conclusion: The findings suggest SC beliefs are important for managing setbacks-specifically for attenuating harmful rumination, and specific setback anxieties. We discuss the possibility of enhancing SC beliefs for combatting sport setbacks through control-enhancing interventions as a direction for future research.

2.
JMIR Perioper Med ; 6: e40402, 2023 May 31.
Article En | MEDLINE | ID: mdl-37256676

BACKGROUND: Pelvic organ prolapse (POP) refers to symptomatic descent of the vaginal wall. To reduce surgical failure rates, surgical correction can be augmented with the insertion of polypropylene mesh. This benefit is offset by the risk of mesh complication, predominantly mesh exposure through the vaginal wall. If mesh placement is under consideration as part of prolapse repair, patient selection and counseling would benefit from the prediction of mesh exposure; yet, no such reliable preoperative method currently exists. Past studies indicate that inflammation and associated cytokine release is correlated with mesh complication. While some degree of mesh-induced cytokine response accompanies implantation, excessive or persistent cytokine responses may elicit inflammation and implant rejection. OBJECTIVE: Here, we explore the levels of biomaterial-induced blood cytokines from patients who have undergone POP repair surgery to (1) identify correlations among cytokine expression and (2) predict postsurgical mesh exposure through the vaginal wall. METHODS: Blood samples from 20 female patients who previously underwent surgical intervention with transvaginal placement of polypropylene mesh to correct POP were collected for the study. These included 10 who experienced postsurgical mesh exposure through the vaginal wall and 10 who did not. Blood samples incubated with inflammatory agent lipopolysaccharide, with sterile polypropylene mesh, or alone were analyzed for plasma levels of 13 proinflammatory and anti-inflammatory cytokines using multiplex assay. Data were analyzed by principal component analysis (PCA) to uncover associations among cytokines and identify cytokine patterns that correlate with postsurgical mesh exposure through the vaginal wall. Supervised machine learning models were created to predict the presence or absence of mesh exposure and probe the number of cytokine measurements required for effective predictions. RESULTS: PCA revealed that proinflammatory cytokines interferon gamma, interleukin 12p70, and interleukin 2 are the largest contributors to the variance explained in PC 1, while anti-inflammatory cytokines interleukins 10, 4, and 6 are the largest contributors to the variance explained in PC 2. Additionally, PCA distinguished cytokine correlations that implicate prospective therapies to improve postsurgical outcomes. Among machine learning models trained with all 13 cytokines, the artificial neural network, the highest performing model, predicted POP surgical outcomes with 83% (15/18) accuracy; the same model predicted POP surgical outcomes with 78% (14/18) accuracy when trained with just 7 cytokines, demonstrating retention of predictive capability using a smaller cytokine group. CONCLUSIONS: This preliminary study, incorporating a sample size of just 20 participants, identified correlations among cytokines and demonstrated the potential of this novel approach to predict mesh exposure through the vaginal wall following transvaginal POP repair surgery. Further study with a larger sample size will be pursued to confirm these results. If corroborated, this method could provide a personalized medicine approach to assist surgeons in their recommendation of POP repair surgeries with minimal potential for adverse outcomes.

3.
Front Sports Act Living ; 4: 949501, 2022.
Article En | MEDLINE | ID: mdl-36051965

Older adults make up the largest portion of the population of physically inactive individuals. Health challenges, and psychological barriers (e.g., maladaptive causal attributions), contribute to reduced activity engagement and low perceived control. This pilot study tested an attributional retraining (AR) intervention designed to increase control-related outcomes in a physical activity context for older adults with compromised health. Using a randomized treatment design, we examined treatment effects on a sample of older adults attending a day hospital (N = 37, M age = 80). We employed ANCOVAs, controlling for age, sex, and morbidity, to assess differences in post-treatment outcomes between AR and No-AR conditions. AR recipients (vs. No-AR) reported lower post-treatment helplessness and more perceived control over their health. Our study offers evidence for AR to increase control-related outcomes and lays the groundwork for further research into supporting older adult populations with compromised health.

4.
Soc Psychol Educ ; 25(5): 1031-1049, 2022.
Article En | MEDLINE | ID: mdl-35996464

Research suggests that when dealing with personal setbacks, secondary control (SC) adjustment and acceptance beliefs can foster psychological wellbeing. However, little research has examined these beliefs, in combination, and how they impact students in their academic development. We conducted secondary analysis using an eight-month longitudinal study design over a two-semester introductory course on a sample of university students (n = 237; 64% female; M age = 19 years old). Multiple regression analyses assessed whether the students' Semester 1 adjustment and acceptance SC beliefs influenced Semester 2 learning-related emotions, perceived stress, and perceived course success, and whether Adjustment x Acceptance interactions emerged involving these outcomes. Adjustment beliefs promoted learning-related positive emotions (hope, pride), perceived course success, and reduced perceived stress; acceptance predicted higher shame and perceived stress. Students' adjustment predicted lower helplessness for students with high acceptance beliefs. These findings are discussed in light of the role that SC beliefs might play in curbing psychological distress reported by students on postsecondary campuses.

5.
Front Sports Act Living ; 4: 814301, 2022.
Article En | MEDLINE | ID: mdl-35252857

OBJECTIVES: During COVID-19 athletes have had games canceled, seasons postponed, and social supports lost. These changes negatively impact their motivation, and potentially identity, as athletes. We draw on self-determination theory to examine motivation in sport and its relationship with athlete identity during COVID-19. DESIGN: A cross-sectional study design was employed consisting of online quantitative surveys. METHOD: We gathered background engagement and motivation data from 115 athletes involved in organized sport. They responded to questions on basic psychological needs satisfaction (competence, relatedness, autonomy) and athlete identity. RESULTS: When reflecting on their basic psychological needs during the pandemic, most athletes considered them important. Athletes' competence and relatedness in sport were associated with social-related athlete identity, but not autonomy. Only relatedness in sport was associated with exclusivity-related social identity. CONCLUSIONS: Using a self-determination theoretical lens, our findings contribute to understanding athlete motivation and identities when sport is interrupted.

6.
Article En | MEDLINE | ID: mdl-34770226

Boredom is a salient emotion experienced in postsecondary settings, and evidence reveals that it can negatively impact academic achievement and motivation. Drawing from the control-value theory (CVT) of achievement emotions (Pekrun, 2006) and the component process model of emotions (CPM; Scherer, 1984), our study examines the first phase of a multi-sequenced online boredom intervention training (BIT) program. The goal of Phase I of BIT was to increase university students' (N = 85) knowledge about boredom as a scholarly construct. Students completed four components of the Phase I BIT session, including: (a) a baseline survey and knowledge quiz, (b) a psychoeducational video, (c) a consolidation exercise, and (d) a follow-up knowledge quiz. We employed a repeated measures analysis to measure changes in knowledge after students watched the psychoeducational boredom video. Our findings reveal that students became more knowledgeable about boredom, learned something novel, and were interested in the intervention. The results are discussed in terms of the implications for research, theory, and practice.


Boredom , Motivation , Achievement , Emotions , Humans , Students
7.
Soc Psychol Educ ; 24(1): 299-318, 2021.
Article En | MEDLINE | ID: mdl-33613084

During the northern hemisphere Winter 2020 academic term, university students had to adjust to remote learning in response to the COVID-19 pandemic. This abrupt change provided a unique opportunity to examine students' motivation, engagement and perceptions of success and cheating under two learning conditions, namely traditional and remote. We used a single survey to collect retrospective self-report data from a convenience sample of Canadian undergraduate students (n = 98) about their motivation, engagement and perceptions of success and cheating before COVID-19 and then in remote learning. Students' achievement goals, engagement and perceptions of success all significantly decreased, while their perceptions of cheating increased. Moreover, we used regression analyses to examine associations amongst achievement goals and engagement, perceptions of success and cheating concerns. Mastery-approach goals were positively associated with more engagement and higher perceptions of success. Achievement goals were unrelated to cheating. Students in large classes and who were originally concerned about cheating became more concerned about cheating in remote learning conditions. Our study provides information to researchers and instructors about how achievement goals relate to student outcomes across learning conditions. By extension, we provide timely recommendations for instructors as they continue to wrestle with how to deliver their courses during the COVID-19 pandemic.

8.
Psychol Sci ; 31(6): 623-633, 2020 06.
Article En | MEDLINE | ID: mdl-32374639

Despite increased emphasis on educating students in science, technology, engineering, and mathematics (STEM) disciplines, nearly half of U.S. college students who enroll in these programs fail to graduate with STEM degrees. Using archival data from the Motivation and Academic Achievement Database, we tested whether a motivation intervention to reframe causal attributions for academic setbacks improved graduation rates for college students in STEM disciplines (N = 496). Results showed that the intervention increased the odds of 8-year graduation for students who were at risk of college dropout. Findings highlight the potential of theory-informed psychological interventions to increase persistence to graduation for at-risk students in STEM fields.


Achievement , Motivation , Self Concept , Students/psychology , Adolescent , Engineering/education , Female , Humans , Logistic Models , Male , Mathematics/education , Science/education , Sex Factors , Technology/education , Universities
9.
Psychol Health ; 34(2): 216-231, 2019 02.
Article En | MEDLINE | ID: mdl-30595055

OBJECTIVES: Although physical activity is recognised as a health-promoting behaviour for older adults, notable barriers exist that may reduce physical activity in this age group. Limited research has explored causal beliefs (attributions) as a barrier to physical activity. Our study assessed associations between older adults' attributions about physical activity and objective health outcomes. METHODS: We examined the role of attributions as a predictor of everyday physical activity (EPA) and subsequent mortality risk over a 10-year period (2006-2016) in a sample of older adults (Mage = 87, N = 261). RESULTS: OLS and Cox proportional hazard regression analyses revealed older adults who endorsed more internal and uncontrollable attributions for limited activity (physical incapacity) when feeling unwell had lower subsequent EPA (ß = -0.18), and higher 10-year mortality risk (HR = 1.46). Other attributions with different dimensional properties (e.g. internal and controllable) were not associated with EPA or mortality. DISCUSSION: Findings suggest that causal beliefs older adults have about their physical activity can influence their future behaviour and longevity. Psychological treatments designed to discourage maladaptive attributional thinking for older populations who face barriers to physical activity may be an important avenue for future research.


Exercise/psychology , Mortality , Thinking , Aged, 80 and over , Female , Humans , Male , Psychological Theory , Risk Assessment
10.
Soc Sci Med ; 232: 444-452, 2019 07.
Article En | MEDLINE | ID: mdl-30409727

RATIONALE AND OBJECTIVES: Whether expectations about future health are adaptive or maladaptive in late life likely depends on the extent to which they conform to or defy a future reality of declining health. Our premise was that, when adults face a downward spiral in health, it can be adaptive to realistically expect poorer future health and maladaptive to unrealistically expect good health. METHOD: This 18-year-long study of community-dwelling older Canadians (n = 132, 72-98 years) involved a baseline interview to identify those who anticipated heath would decline (pessimistic expectation) or improve/remain stable (optimistic expectation). We determined initial (baseline) health status by assessing the severity of chronic conditions. An objective within-person measure of actual health change was derived by documenting hospital admissions (HAs) over time to capture a continuum that ranged from no declines (HAs remained stable) to greater declines in health (increasing numbers of HAs). Our a priori hypotheses examined the effects of health expectations (pessimistic, optimistic) and actual health change on the outcomes of depressive symptoms and mortality. RESULTS: Support was found for our premise that it is adaptive to be realistic when forecasting future health, at least at low levels of initial chronic condition severity. Regression analyses showed that realistically pessimistic (vs. unrealistically optimistic) expectations predicted significantly fewer depressive symptoms and a lower risk of death. The results also supported our premise that it is maladaptive to be unrealistically optimistic when health subsequently declines in reality: The risk of death was 313% higher for those with optimistic expectations that were unrealistic (vs. realistic). CONCLUSION: These findings provide insights for health care professionals regarding the messages they communicate to their patients. Together, they imply that, when good health is slipping away, it seems optimal to encourage a healthy dose of realism.


Health Status , Motivation , Optimism/psychology , Pessimism/psychology , Aged , Aged, 80 and over , Canada/epidemiology , Depression/epidemiology , Female , Humans , Longitudinal Studies , Male , Mortality , Risk
11.
Psychol Aging ; 32(7): 628-635, 2017 Nov.
Article En | MEDLINE | ID: mdl-28981305

Although an active pursuit of health goals is typically adaptive, there may be circumstances in very late life when it is not. Our 10-year study of community-dwelling individuals (n = 220, 79-98 years-old) examined whether investing substantial effort into personal health (high selective primary control) in the absence of help-seeking strategies (low compensatory primary control) jeopardized survival for very old adults who varied in functional independence (low, high). Cox proportional hazard models showed selective primary control (SPC) predicted 10-year mortality risk for only those with low compensatory primary control (CPC) and high initial functional independence. For these individuals, each standard deviation increase in SPC predicted a 101% higher risk of death. Results are consistent with the lines-of-defense model (Heckhausen et al., 2013) and suggest that, for very old adults with little previous need for help-seeking strategies, tenacious self-reliance (high SPC, low CPC) may have life-shortening consequences. (PsycINFO Database Record


Aging/psychology , Health Behavior , Proportional Hazards Models , Aged , Aged, 80 and over , Female , Help-Seeking Behavior , Humans , Longevity , Male
12.
J Am Assoc Nurse Pract ; 29(3): 157-178, 2017 Mar.
Article En | MEDLINE | ID: mdl-28233460

Primary care practitioners (PCPs) are playing an increasingly important role in the management and care of psoriasis. Thus, it is important for PCPs to be knowledgeable about the disease and to be able to differentiate between common myths and facts related to diagnosis and treatment. By building relationships with their patients and working collaboratively with dermatology health professionals and other specialists, PCPs can facilitate communication about the patient's treatment preferences and expectations for symptom relief, and they may be better able to work with the patient to optimize treatment adherence. This review aims to provide PCPs with a primer on psoriasis, its associated comorbidities, and its impact on patients' quality of life. Discussion topics include psoriasis epidemiology, triggering factors, clinical presentation, differential diagnosis, comorbidities, and approaches to treatment. This review also highlights the importance of staying abreast of advances in the understanding of psoriasis pathogenesis as well as emerging therapeutic treatment options, because these advances may change the treatment landscape and increase patients' expectations for skin clearance.


Primary Health Care/methods , Psoriasis/pathology , Psoriasis/therapy , Depression/psychology , Humans , Nurse Practitioners/standards , Psoriasis/diagnosis , Quality of Life/psychology , Skin Cream/adverse effects , Skin Cream/therapeutic use
13.
Toxicol Appl Pharmacol ; 272(1): 147-53, 2013 Oct 01.
Article En | MEDLINE | ID: mdl-23732083

Exposure to arsenic results in several types of cancers as well as heart disease. A major contributor to ischemic heart pathologies is coronary artery disease, however the influences by environmental arsenic in this disease process are not known. Similarly, the impact of toxicants on blood vessel formation and function during development has not been studied. During embryogenesis, the epicardium undergoes proliferation, migration, and differentiation into several cardiac cell types including smooth muscle cells which contribute to the coronary vessels. The TGFß family of ligands and receptors is essential for developmental cardiac epithelial to mesenchymal transition (EMT) and differentiation into coronary smooth muscle cells. In this in vitro study, 18hour exposure to 1.34µM arsenite disrupted developmental EMT programming in murine epicardial cells causing a deficit in cardiac mesenchyme. The expression of EMT genes including TGFß2, TGFß receptor-3, Snail, and Has-2 are decreased in a dose-dependent manner following exposure to arsenite. TGFß2 cell signaling is abrogated as detected by decreases in phosphorylated Smad2/3 when cells are exposed to 1.34µM arsenite. There is also loss of nuclear accumulation pSmad due to arsenite exposure. These observations coincide with a decrease in vimentin positive mesenchymal cells invading three-dimensional collagen gels. However, arsenite does not block TGFß2 mediated smooth muscle cell differentiation by epicardial cells. Overall these results show that arsenic exposure blocks developmental EMT gene programming in murine coronary progenitor cells by disrupting TGFß2 signals and Smad activation, and that smooth muscle cell differentiation is refractory to this arsenic toxicity.


Arsenites/toxicity , Coronary Vessels/cytology , Epithelial-Mesenchymal Transition/drug effects , Signal Transduction/drug effects , Stem Cells/drug effects , Transforming Growth Factor beta/physiology , Animals , Blotting, Western , Cell Differentiation/drug effects , Cell Line , Cell Survival/drug effects , Coronary Vessels/drug effects , Fluorescent Antibody Technique , Indicators and Reagents , Mesenchymal Stem Cells/drug effects , Mice , Microfilament Proteins/genetics , Muscle Proteins/genetics , Myocytes, Smooth Muscle/drug effects , Smad Proteins/metabolism
14.
Cell Signal ; 22(6): 968-76, 2010 Jun.
Article En | MEDLINE | ID: mdl-20159036

During embryonic development, cells comprising the outermost layer of the heart or epicardium play a critical role in the formation of the coronary vasculature. Thus, uncovering the molecular mechanisms that govern epicardial cell behavior is imperative to better understand the etiology of cardiovascular diseases. In this study, we investigated the function of hyaluronan (HA), a major component of the extracellular matrix, in the modulation of epicardial signaling. We show that stimulation of epicardial cells with high molecular weight HA (HMW-HA) promotes the association of MEKK1 with the HA receptor CD44 and induces MEKK1 phosphorylation. This leads to the activation of two distinct pathways, one ERK-dependent and another NFkappaB-dependent. Furthermore, HMW-HA stimulates epicardial cells to differentiate and invade, as suggested by increased vimentin expression and enhanced invasion through a collagen matrix. Blockade of CD44, transfection with a kinase-inactive MEKK1 construct or the use of ERK1/2 and NFkappaB inhibitors significantly abrogates the invasive response to HMW-HA. Together, these findings suggest an important role for HA in the regulation of epicardial cell fate via activation of MEKK1 signaling cascades.


Hyaluronic Acid/pharmacology , MAP Kinase Kinase Kinase 1/metabolism , MAP Kinase Signaling System , Pericardium/enzymology , Animals , Cell Differentiation , Cell Line , Cell Movement , Extracellular Signal-Regulated MAP Kinases/metabolism , Hyaluronan Receptors/metabolism , Mice , Mice, Transgenic , NF-kappa B/metabolism , Pericardium/cytology , Pericardium/drug effects , Serum Response Element , Snail Family Transcription Factors , Transcription Factors/metabolism
15.
Glycobiology ; 19(8): 890-8, 2009 Aug.
Article En | MEDLINE | ID: mdl-19451547

Hyaluronan (HA) induces changes in cellular behavior that are crucial during both embryonic development and cancer progression. However, the biological effects of varying sizes of HA and the signal transduction mechanisms that these polymers may activate remain unclear. In this study, we demonstrate that pulse stimulation of mouse embryonic fibroblasts with high-molecular-weight (HMW) HA, but not HA of lower molecular sizes, leads to increases in Snail2 protein which are dependent on NFkappaB activity. Involvement of CD44, the main HA receptor, in these responses was determined by use of a CD44 blocking antibody and CD44 siRNA. Both the blockade and silencing of CD44 significantly abrogate the increases in nuclear factor kappaB (NFkappaB) activity and Snail2 protein following HMW-HA stimulation. Furthermore, we show that HMW-HA induces cellular invasion and that inhibition of CD44, Snail2, or NFkappaB significantly decreases this response. These studies elucidate a novel HA/Snail2 functional connection through CD44 and NFkappaB that is important for the induction of cellular invasion and is dependent on HA size.


Cell Movement/physiology , Hyaluronic Acid/metabolism , Transcription Factors/metabolism , Animals , Fibroblasts/metabolism , Hyaluronan Receptors/metabolism , Mice , NF-kappa B/metabolism , NIH 3T3 Cells , Signal Transduction/physiology , Snail Family Transcription Factors
16.
Circ Res ; 103(12): 1430-40, 2008 Dec 05.
Article En | MEDLINE | ID: mdl-19008476

Congenital heart defects occur at a rate of 5% and are the most prevalent birth defects. A better understanding of the complex signaling networks regulating heart development is necessary to improve repair strategies for congenital heart defects. The mitogen-activated protein 3 kinase (MEKK3) is important to early embryogenesis, but developmental processes affected by MEKK3 during heart morphogenesis have not been fully examined. We identify MEKK3 as a critical signaling molecule during endocardial cushion development. We report the detection of MEKK3 transcripts to embryonic hearts before, during, and after cardiac cushion cells have executed epithelial-to-mesenchymal transition (EMT). MEKK3 is observed to endocardial cells of the cardiac cushions with a diminishing gradient of expression into the cushions. These observations suggest that MEKK3 may function during production of cushion mesenchyme as required for valvular development and septation of the heart. We used a kinase inactive form of MEKK3 (MEKK3(KI)) in an in vitro assay that recapitulates in vivo EMT and show that MEKK3(KI) attenuates mesenchyme formation. Conversely, constitutively active MEKK3 (ca-MEKK3) triggers mesenchyme production in ventricular endocardium, a tissue that does not normally undergo EMT. MEKK3-driven mesenchyme production is further substantiated by increased expression of EMT-relevant genes, including TGFbeta(2), Has2, and periostin. Furthermore, we show that MEKK3 stimulates EMT via a TGFbeta(2)-dependent mechanism. Thus, the activity of MEKK3 is sufficient for developmental EMT in the heart. This knowledge provides a basis to understand how MEKK3 integrates signaling cascades activating endocardial cushion EMT.


Endocardial Cushions/embryology , Endocardial Cushions/enzymology , Epithelial Cells/cytology , Epithelial Cells/enzymology , MAP Kinase Kinase Kinase 3/physiology , Mesoderm/embryology , Morphogenesis/physiology , Transforming Growth Factor beta2/physiology , Animals , Cell Differentiation/physiology , Endocardial Cushions/cytology , Endocardial Cushions/metabolism , Epithelial Cells/metabolism , Gene Expression Regulation, Enzymologic/physiology , MAP Kinase Kinase Kinase 3/deficiency , MAP Kinase Kinase Kinase 3/genetics , MAP Kinase Kinase Kinase 3/metabolism , Mesoderm/cytology , Mesoderm/metabolism , Mice
17.
Dev Dyn ; 235(10): 2761-70, 2006 Oct.
Article En | MEDLINE | ID: mdl-16894626

Congenital heart malformations occur at a rate of one per one hundred births and are considered the most frequent birth defects. This high incidence of cardiac defects underscores the complex developmental processes required to form the first functioning organ in mammals. The molecular cues which govern heart development are poorly defined and require an improved understanding in order to advance repair strategies for heart defects. The cytoplasmic MAP kinase kinase kinase, MEKK4, is a critical effector in cellular stress responses; however, the function of MEKK4 during embryonic development and cardiogenesis is not well understood. We have identified MEKK4 as a critical signaling molecule during cardiovascular development. We report the detection of MEKK4 transcripts to early myocardium, endocardium and to cardiac cushion cells that have executed epithelial to mesenchymal transformation (EMT). These observations suggest that MEKK4 may function during production of the cushion mesenchyme as required to create valves and the septated heart. We used a kinase inactive form of MEKK4(MEKK4(KI)) in an in vitro assay that recapitulates in vivo EMT, and show that MEKK4(KI) attenuates mesenchyme production. However, addition of a constitutively active MEKK4 into ventricular explants, a system that does not normally undergo EMT, is not able to cause mesenchymal cell outgrowth. Thus, the kinase activity of MEKK4 is essential, but not sufficient, to support developmental EMT. This knowledge provides a basis to understand how MEKK4 may integrate signaling cascades controlling heart development.


Epithelial Cells/metabolism , Heart Ventricles/metabolism , MAP Kinase Kinase Kinase 4/genetics , Mesoderm/metabolism , Animals , Blotting, Western , Cell Differentiation/genetics , Cell Differentiation/physiology , Epithelial Cells/cytology , Epithelial Cells/enzymology , Female , Gene Expression Regulation, Developmental/genetics , Heart Ventricles/embryology , Heart Ventricles/enzymology , Immunohistochemistry , Immunoprecipitation , In Situ Hybridization/methods , In Vitro Techniques , MAP Kinase Kinase Kinase 4/metabolism , Mesoderm/cytology , Mesoderm/enzymology , Mice , Organogenesis/genetics , Organogenesis/physiology , Pregnancy
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