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1.
Carbohydr Polym ; 230: 115726, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31887919

RESUMO

The study tried to investigate whether apple polysaccharide (AP) could prevent colitis associated colorectal cancer (CACC) through the regulation of intestinal microbiota disorders. 10 % AP (w/v) was administrated to ICR mice by gavage for 15 wk. It was found that AP treatment protected against CACC in mice effectively. The level of Lactobacillus in the intestine of AOM/DSS-treated mice was significantly decreased and that of Fusobacterium increased; while AP could reverse this trend and increase the intestinal microbiota diversity. The number of T cells and macrophages in the colon tissue of mice in AOM/DSS group elevated; while AP could reduce the number of these cells significantly. AP suppressed nuclear aggregation of ß-catenin, inhibited the activation of Wnt pathway in colon tissues. These data suggest that AP prevented ICR mice from CACC at least in part through regulating intestinal flora disorder and Wnt pathway.

3.
Protein Cell ; 2019 Dec 09.
Artigo em Inglês | MEDLINE | ID: mdl-31814083

RESUMO

The author would like to add the below information in this correction. A similar study from Chao Lu group was published online on 5 September 2019 in Nature, entitled "The histone mark H3K36me2 recruits DNMT3A and shapes the intergenic DNA methylation landscape" (Weinberg et al., 2019). Although both the studies reported the preferential recognition of H3K36me2 by DNMT3A PWWP, ours in addition uncovered a stimulation function by such interaction on the activity of DNMT3A. On the disease connections, we used a NSD2 gain-of-function model which led to the discovery of potential therapeutic implication of DNA inhibitors in the related cancers, while the other study only used NSD1 and DNMT3A loss-of-function models.

4.
Artigo em Inglês | MEDLINE | ID: mdl-31770317

RESUMO

STUDY DESIGN: Basic science. OBJECTIVE: The aim of this study was to examine the effect of vascular endothelial growth factor (VEGF)-transfected bone marrow mesenchymal stem cells (BMSCs) on the recovery of motor and sensory functions of rats with spinal cord injury (SCI). SUMMARY OF BACKGROUND DATA: There is no effective treatment to protect against SCI. BMSCs have been widely applied to the treatment of nervous system damage due to the function of prompt neurite growth and inhibition of demyelination following injury. METHODS: VEGF-transfected BMSCs were injected to rats with SCI and the recovery of motor and sensory functions was observed. The Basso, Beattie, and Bresnahan, mechanical withdrawal threshold and thermal withdraw latency grading was conducted to assess the recovery status of motor and sensory functions of the SCI rats. The expression of VEGF, CD31, and NF200 was detected by immunofluorescence. RESULTS: The recovery of the rat motor and sensory functions in the VEGF-transfected BMSC (BMSC-VEGF) group was higher than those of the other groups with the exception of the Sham group (P < 0.05). The expression of the CD31 and NF200 proteins in the rat SCI regions was the highest in the BMSC-VEGF group, whereas the survival of BMSC in the BMSC-VEGF group was increased compared with that in the BMSC-Ad group. In addition, the injection of VEGF-transfected BMSCs can improve the angiogenesis of the injured area and retain the survival of injected cells and neurons. CONCLUSION: The injection of BMSC-VEGF improved the recovery of motor function in SCI rats. LEVEL OF EVIDENCE: N/A.

5.
Nat Commun ; 10(1): 4540, 2019 10 04.
Artigo em Inglês | MEDLINE | ID: mdl-31586054

RESUMO

Antimony trisulfide (Sb2S3) is considered to be a promising photovoltaic material; however, the performance is yet to be satisfactory. Poor power conversion efficiency and large open circuit voltage loss have been usually ascribed to interface and bulk extrinsic defects By performing a spectroscopy study on Sb2S3 polycrystalline films and single crystal, we show commonly existed characteristics including redshifted photoluminescence with 0.6 eV Stokes shift, and a few picosecond carrier trapping without saturation at carrier density as high as approximately 1020 cm-3. These features, together with polarized trap emission from Sb2S3 single crystal, strongly suggest that photoexcited carriers in Sb2S3 are intrinsically self-trapped by lattice deformation, instead of by extrinsic defects. The proposed self-trapping explains spectroscopic results and rationalizes the large open circuit voltage loss and near-unity carrier collection efficiency in Sb2S3 thin film solar cells. Self-trapping sets the upper limit on maximum open circuit voltage (approximately 0.8 V) and thus power conversion efficiency (approximately 16 %) for Sb2S3 solar cells.

6.
J Exp Bot ; 70(21): 6113-6125, 2019 Nov 18.
Artigo em Inglês | MEDLINE | ID: mdl-31618418

RESUMO

Cell viability requires the maintenance of intracellular homeostasis through the unfolded protein response mediated by receptors localized on the endoplasmic reticulum (ER) membrane. The receptor IRE1 mediates not only various adaptive outputs but also programmed cell death (PCD) under varying stress levels. However, little is known about the mechanism by which the same receptors trigger different responses in plants. Arabidopsis Golgi anti-apoptotic protein 1 (GAAP1) and GAAP3 resist PCD upon ER stress and negatively modulate the adaptive response of the IRE1-bZIP60 pathway through IRE1 association. To elucidate the mechanism underlying the anti-PCD activity of GAAPs, we attempted to isolate interactors of GAAPs by yeast two-hybrid screening. Membrane-associated progesterone receptor 3 (MAPR3) was isolated as one of the factors interacting with GAAP. Mutations in GAAP1/GAAP3 and/or MAPR3 enhanced the sensitivity of seedlings to ER stress. Whole-transcriptome analysis combined with quantitative reverse transcription-PCR and cellular analysis showed that regulated IRE1-dependent decay (RIDD) and autophagy were impaired in mutants mapr3, gaap1mapr3, and gaap3mapr3. MAPR3, GAAP1, and GAAP3 interacted with IRE1B as determined by protein interaction assays. These data suggest that the interaction of GAAP1/GAAP3 with MAPR3 mitigates ER stress to some extent through regulating IRE10-mediated RIDD and autophagy.

7.
Infect Drug Resist ; 12: 2471-2476, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31496761

RESUMO

Purpose: Gentamicin is a promising antimicrobial for the treatment of gonorrhea. The study aimed to evaluate gentamicin minimum inhibitory concentrations (MICs) of Neisseria gonorrhoeae isolates in China. Methods: In this study, the agar dilution method was used to determine the MICs of 470 isolates collected in 2016 to four effective antimicrobials (gentamicin, azithromycin, ceftriaxone, and spectinomycin). Results: Gentamicin MICs ranged from 1 to 8 mg/L. No isolate was resistant to gentamicin. Of seven isolates simultaneously resistant to azithromycin and ceftriaxone, 6 isolates demonstrated MICs of 4 mg/L or less to gentamicin. No cross relationships were found between MICs of gentamicinand susceptibility profiles of azithromycin, ceftriaxone, and spectinomycin. Conclusion: The in vitro results suggest that gentamicin can be a promising treatment option for gonococcal infections in China. Clinical trials to evaluate the therapeutic efficacy of gentamicin are required.

8.
Front Pharmacol ; 10: 817, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31379582

RESUMO

Apolipoprotein A-I (apoA-I) mimetic peptide, D-4F, exhibits anti-atherogenic effects similar to high-density lipoprotein (HDL). However, it remains elusive whether D-4F and HDL share similar molecular mechanisms underlying anti-atherogenic effects and endothelial cell protections. We here compared the metabolic changes in endothelial cells induced by D-4F and HDL against oxidized low-density lipoprotein (ox-LDL), which may be of benefit to understanding the protective mechanisms of HDL and D-4F. Functional assays, including wound healing, transwell migration, and tube formation, were used to evaluate the pro-angiogenic effects of HDL and D-4F. NMR-based metabolomic analysis was employed to explore the protective mechanisms underlying HDL and D-4F. Partial least-squares discriminant analysis (PLS-DA) was performed to assess metabolic profiles, and orthogonal PLS-DA (OPLS-DA) was carried out to identify characteristic metabolites. Moreover, significantly altered metabolic pathways were also analyzed. We found that ox-LDL impaired the migration and tube formation of endothelial cells. Metabolomic analysis showed that ox-LDL triggered oxidative stress, impaired glycolysis, and enhanced glycerophospholipid metabolism. Both HDL and D-4F improved the migration and angiogenesis of endothelial cells, alleviated oxidative stress, and ameliorated disordered glycolysis impaired by ox-LDL. Strikingly, HDL partially attenuated the disturbed glycerophospholipid metabolism, whereas D-4F did not show this effect. In summary, although D-4F shared the similar protective effects with HDL on the migration and angiogenesis of endothelial cells, it could not deduce the molecular mechanisms of HDL completely. Nevertheless, D-4F possesses the potentiality to be exploited as clinically applicable agent for endothelial cell protection and cardiovascular disease treatment.

9.
Eur J Nutr ; 2019 Jul 16.
Artigo em Inglês | MEDLINE | ID: mdl-31312904

RESUMO

PURPOSE: Obesity, substantially increasing the risk of diseases such as metabolic diseases, becomes a major health challenge. In this study, we, therefore, investigated the effect of modified apple polysaccharide (MAP) on obesity. METHODS: Twelve male C57BL/6J mice were given a 45% high-fat diet (HFD) for 12 weeks to replicate an obesity model and six mice were given normal diet as control. Then, 1 g/kg MAP was administrated to six mice by gavage for 15 days. Illumina Miseq PE300 sequencing platform was used to analyze the microbial diversity of fecal samples. Flow cytometry was employed to investigate the effects of MAP on immune cells in adipose tissue. Bacterial culture and qPCR were used to assess the effects of MAP on the growth of whole fecal bacteria and representative microbiota in vitro. RESULTS: MAP could alleviate HFD-induced obesity and decrease body weight of mice effectively. The results of α diversity showed that Shannon index in HFD group was significantly lower than that in control group; Shannon index in MAP group was higher than that in HFD group. The results of ß diversity showed that the microbiota of MAP group was more similar to that of control group. HFD increased the number of T cells and macrophages in adipocytes; while MAP decreased the number of T cells and macrophages. MAP could promote the growth of fecal bacteria, and demonstrated a facilitated effect on the proliferation of Bacteroidetes, Bacteroides, Lactobacillus, and an inhibitory effect on Fusobacterium. CONCLUSIONS: MAP could reduce HFD-induced obesity of mice effectively. The possible mechanisms are that MAP restored HFD-induced intestinal microbiota disorder, downregulated the number of T cells and macrophages in adipose tissue.

10.
Cell Res ; 29(1): 90, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30559438

RESUMO

We apologize for an error introduced during format conversion in the paper published online on 18 October 2018. The resolution of the MALDI-TOF result in Fig. 1e underwent an unexpected reduction when transformed from Powerpoint format. The corrected Fig. 1e is provided below on the left.

12.
Se Pu ; 36(9): 904-910, 2018 Sep 08.
Artigo em Chinês | MEDLINE | ID: mdl-30251519

RESUMO

A method was developed for the simultaneous separation and determination of 12 direct dyes in cosmetics by high performance liquid chromatography (HPLC). The analytes were separated on an XB-C18 column with acetonitrile-0.02 mol/L ammonium acetate aqueous solution (pH 9.0) as the mobile phases, and were detected using a diode array detector. The results indicated that the 12 direct dyes had good linearities with correlation coefficients greater than 0.999. The limits of detection were between 0.017 µ g/g and 1.7 µ g/g. The average recoveries ranged from 85.6% to 113.4%, and the relative standard deviations (RSDs) ranged from 1.0% to 7.7%. The intra-and inter-day RSDs were 0.4%-6.5% and 0.2%-7.5%, respectively. The method is simple, rapid, accurate, and is suitable for the determination of direct dyes in cosmetics.


Assuntos
Cromatografia Líquida de Alta Pressão , Corantes/análise , Cosméticos/análise , Acetatos , Acetonitrilos
13.
Talanta ; 189: 606-621, 2018 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-30086967

RESUMO

Ultra-high-performance liquid chromatography combined with quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF-MS) has recently been widely used in qualitative analyses of traditional Chinese medicine (TCM) prescriptions. However, a poor understanding of detected mass spectral data has rendered data processing difficult and time-consuming. Efficient and widespread data analysis methods focused on identifying both phytochemical compounds and metabolites of TCM prescriptions have rarely been described. In this study, a new MS network analysis pattern that uses model drug Lishukang (LSK) capsules to accelerate the data processing of TCM preparations is developed. The MS network analysis pattern integrates intrinsic structural correlations of phytochemical compounds and structural information derived from mass spectrometry to identify the same types of compounds from a raw data stream. As a result, five MS networks of flavones and flavone glycosides, alkaloids, phenolic acids, saponins and benzylester glucosides in LSK are preliminarily established. 278 compounds, including 9 potential novel compounds are identified or tentatively assigned based on MS networks. Furthermore, 57 potential metabolites of LSK are identified in rat plasma, and potential metabolic pathways are investigated under the guidance of MS networks in vitro. The MS network analysis pattern serves as an integral solution for identifying phytochemical compounds and metabolites of TCM prescriptions. The investigations of LSK also provide essential data for its further study.


Assuntos
Cromatografia Líquida de Alta Pressão/métodos , Espectrometria de Massas/métodos , Medicina Tradicional Chinesa , Cápsulas , Compostos Orgânicos/análise , Fatores de Tempo
14.
Med Mycol ; 56(5): 631-644, 2018 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-29420826

RESUMO

Mucormycosis is one of the most invasive mycosis and has caused global concern in public health. Cutaneous mucormycosis caused by Mucor irregularis (formerly Rhizomucor variabilis) is an emerging disease in China. To survive in the human body, M. irregularis must overcome the hypoxic (low oxygen) host microenvironment. However, the exact molecular mechanism of its pathogenicity and adaptation to low oxygen stress environment is relatively unexplored. In this study, we used Illumina HiSeq technology (RNA-Seq) to determine and compare the transcriptome profile of M. irregularis CBS103.93 under normal growth condition and hypoxic stress. Our analyses demonstrated a series of genes involved in TCA, glyoxylate cycle, pentose phosphate pathway, and GABA shunt were down-regulated under hypoxic condition, while certain genes in the lipid/fatty acid metabolism and endocytosis were up-regulated, indicating that lipid metabolism was more active under hypoxia. Comparing the data with other important human pathogenic fungi such as Aspergillus spp., we found that the gene expression pattern and metabolism in responses to hypoxia in M. irregularis were unique and different. We proposed that these metabolic changes can represent a species-specific hypoxic adaptation in M. irregularis, and we hypothesized that M. irregularis could use the intra-lipid pool and lipid secreted in the infection region, as an extracellular nutrient source to support its hypoxic growth. Characterizing the significant differential gene expression in this species could be beneficial to uncover their role in hypoxia adaptation and fungalpathogenesis and further facilitate the development of novel targets in disease diagnosis and treatment against mucormycosis.


Assuntos
Dermatomicoses/microbiologia , Regulação Fúngica da Expressão Gênica , Mucor/genética , Mucor/metabolismo , Oxigênio/metabolismo , Transcriptoma , Adaptação Fisiológica , Carbono/metabolismo , Dermatomicoses/metabolismo , Proteínas Fúngicas/genética , Proteínas Fúngicas/metabolismo , Genes Fúngicos/genética , Humanos , Metabolismo dos Lipídeos , Redes e Vias Metabólicas/genética , Mucor/crescimento & desenvolvimento , Mucormicose/metabolismo , Mucormicose/microbiologia , RNA Mensageiro/genética , Reprodutibilidade dos Testes
15.
Mycopathologia ; 183(2): 445-449, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29086142

RESUMO

We report a case of primary cutaneous mucormycosis caused by Mucor irregularis. A 66-year-old man was presented to our hospital with a history of gradually enlarging plaque on the right leg for about a year. The identification of pathogen based on the fungus morphology and DNA sequencing revealed M. irregularis as the responsible fungus for skin lesion. The lesion was removed incidentally by a surgery procedure, and no recrudescence was seen during a follow-up of 24-month observation.


Assuntos
Dermatomicoses/diagnóstico , Dermatomicoses/cirurgia , Mucor/isolamento & purificação , Mucormicose/diagnóstico , Mucormicose/cirurgia , Idoso , Dermatomicoses/patologia , Histocitoquímica , Humanos , Masculino , Técnicas Microbiológicas , Microscopia , Mucor/classificação , Mucor/citologia , Mucor/genética , Mucormicose/patologia , Análise de Sequência de DNA , Resultado do Tratamento
17.
Sci Rep ; 7(1): 10629, 2017 09 06.
Artigo em Inglês | MEDLINE | ID: mdl-28878325

RESUMO

Mucor irregularis is an emerging fungal pathogen that cause cutaneous infection and could cause death. However, little is known about its mechanism of pathogenesis. There is evidence suggesting virulence vary with mating types in fungi, including the Mucorales. Here, we characterized the mating type locus of M. irregularis and the mating type ratio of 17 clinical isolates in China. Genomic data indicated M. irregularis is heterothallic having two mating types - bearing either SexP or SexM allele. Also, we employed a mice model to study the inflammation and pathological effects of different mating types. The comparison of the inflammatory response, cytokine profiles and Th-1, Th-2 and Th-17 cells numbers in each mating type treated mice showed that the severity and disease progress were enhanced in (+) mating type treated mice. One (+/0) mutant strain, with multiple mutations at the mating locus, had defects in sexual mating ability but appeared to be more virulent than the (-) mating type. Although (+) mating type appeared to be more virulent, most of our clinical isolates presented belonged to (-) mating type. Our findings support the involvement of MAT genes in sexual fertility, and the influence of mating type on the severity of cutaneous infection.


Assuntos
Genes Fúngicos Tipo Acasalamento , Mucor/fisiologia , Mucormicose/microbiologia , Virulência/genética , Animais , Biomarcadores , Citocinas/metabolismo , Derme/microbiologia , Derme/patologia , Ordem dos Genes , Imunofenotipagem , Camundongos , Mucor/ultraestrutura , Mucormicose/imunologia , Regiões Promotoras Genéticas , Análise de Sequência de DNA , Subpopulações de Linfócitos T/imunologia , Subpopulações de Linfócitos T/metabolismo
18.
J Cell Mol Med ; 21(12): 3810-3820, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28767201

RESUMO

D-4F, an apolipoprotein A-I (apoA-I) mimetic peptide, possesses distinctly anti-atherogenic effects. However, the biological functions and mechanisms of D-4F on the hyperplasia of vascular smooth muscle cells (VSMCs) remain unclear. This study aimed to determine its roles in the proliferation and migration of VSMCs. In vitro, D-4F inhibited VSMC proliferation and migration induced by ox-LDL in a dose-dependent manner. D-4F up-regulated heme oxygenase-1 (HO-1) expression in VSMCs, and the PI3K/Akt/AMP-activated protein kinase (AMPK) pathway was involved in these processes. HO-1 down-regulation with siRNA or inhibition with zinc protoporphyrin (Znpp) impaired the protective effects of D-4F on the oxidative stress and the proliferation and migration of VSMCs. Moreover, down-regulation of ATP-binding cassette transporter A1 (ABCA1) abolished the activation of Akt and AMPK, the up-regulation of HO-1 and the anti-oxidative effects of D-4F. In vivo, D-4F restrained neointimal formation and oxidative stress of carotid arteries in balloon-injured Sprague Dawley rats. And inhibition of HO-1 with Znpp decreased the inhibitory effects of D-4F on neointimal formation and ROS production in arteries. In conclusion, D-4F inhibited VSMC proliferation and migration in vitro and neointimal formation in vivo through HO-1 up-regulation, which provided a novel prophylactic and therapeutic strategy for anti-restenosis of arteries.


Assuntos
Apolipoproteína A-I/farmacologia , Aterosclerose/prevenção & controle , Heme Oxigenase-1/genética , Músculo Liso Vascular/efeitos dos fármacos , Neointima/prevenção & controle , Substâncias Protetoras/farmacologia , Proteínas Quinases Ativadas por AMP/genética , Proteínas Quinases Ativadas por AMP/metabolismo , Transportador 1 de Cassete de Ligação de ATP/genética , Transportador 1 de Cassete de Ligação de ATP/metabolismo , Animais , Aorta Torácica/citologia , Aorta Torácica/efeitos dos fármacos , Aorta Torácica/metabolismo , Aterosclerose/genética , Aterosclerose/metabolismo , Aterosclerose/patologia , Movimento Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Regulação da Expressão Gênica , Heme Oxigenase-1/metabolismo , Lipoproteínas LDL/antagonistas & inibidores , Lipoproteínas LDL/farmacologia , Masculino , Músculo Liso Vascular/citologia , Músculo Liso Vascular/metabolismo , Miócitos de Músculo Liso/citologia , Miócitos de Músculo Liso/efeitos dos fármacos , Miócitos de Músculo Liso/metabolismo , Neointima/genética , Neointima/metabolismo , Neointima/patologia , Fosfatidilinositol 3-Quinases/genética , Fosfatidilinositol 3-Quinases/metabolismo , Proteínas Proto-Oncogênicas c-akt/genética , Proteínas Proto-Oncogênicas c-akt/metabolismo , Ratos , Ratos Sprague-Dawley , Transdução de Sinais
19.
Acta Biochim Biophys Sin (Shanghai) ; 49(7): 617-627, 2017 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-28475656

RESUMO

Creatine (Cr) supplementation has drawn much attention from researchers owing to its widespread efficacy in sports, and more recently, in therapeutic fields. However, the underlying molecular mechanisms remain elusive. Here, we performed nuclear magnetic resonance-based metabolomic analysis to address the metabolic profile of aqueous extracts from the mouse myoblast cell line C2C12 exposed to 2 mM Cr for 24 h (the Cr-treated group). Results showed that Cr supplementation facilitated the proliferation of C2C12 myoblasts. Both pattern recognition and hierarchical cluster analyses demonstrated that the metabolic profiles of the Cr-treated and control groups were distinctly different. We identified 13 characteristic metabolites significantly responsible for the discrimination of metabolic profiles between the two groups, through orthogonal projection to latent structures discriminant analysis and independent samples t-test. We further verified the discrimination performances of these metabolites by conducting univariate receiver operating characteristic curve analysis. Compared with the control group, the Cr-treated group exhibited increased levels of Cr, phosphocreatine (PCr), glutathione (GSH), and glucose, but decreased levels of leucine, valine, isoleucine, phenylalanine, methionine, choline, O-phosphocholine, sn-glycero-3-phosphocholine, and glycerol. Our results demonstrated that Cr supplementation upregulated PCr and glucose, promoted trichloroacetic acid cycle anaplerotic flux and GSH-mediated antioxidant capacity, and stabilized lipid membranes through suppressing glycerophospholipid metabolism. Our work provides new clues to the molecular mechanisms underlying the pleiotropic effects of Cr in muscle cells.


Assuntos
Creatina/farmacologia , Espectroscopia de Ressonância Magnética/métodos , Metabolômica , Mioblastos/efeitos dos fármacos , Animais , Células Cultivadas , Suplementos Nutricionais , Glutationa/metabolismo , Camundongos , Mioblastos/metabolismo , Curva ROC
20.
Exp Mol Med ; 49(4): e325, 2017 04 28.
Artigo em Inglês | MEDLINE | ID: mdl-28450736

RESUMO

Post-translational modifications, such as methylation, acetylation and phosphorylation, of histone proteins play important roles in regulating dynamic chromatin structure. Histone demethylation has become one of the most active research areas of epigenetics in the past decade. To date, with the exception of histone H3 lysine 79 methylation, the demethylases for all major lysine methylation sites have been discovered. These enzymes have been shown to be involved in various biological processes, with embryonic development being an exciting emerging area. This review will primarily discuss the involvement of these demethylases in the regulation of mammalian embryonic development, including their roles in embryonic stem cell pluripotency, primordial germ cell (PGC) formation and maternal-to-zygotic transition.


Assuntos
Desenvolvimento Embrionário , Regulação da Expressão Gênica no Desenvolvimento , Histona Desmetilases/metabolismo , Animais , Diferenciação Celular , Humanos
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