CD4-Positive T-Lymphocytes/enzymology; Cyclin-Dependent Kinase 4/metabolism; Cyclin-Dependent Kinase 6/metabolism; Cyclins/metabolism; Precursor Cell Lymphoblastic Leukemia-Lymphoma/enzymology; Receptor, Notch1/metabolism; Animals; CD4-Positive T-Lymphocytes/pathology; Cell Line, Tumor; Cyclin D3; Cyclin-Dependent Kinase 4/genetics; Cyclin-Dependent Kinase 6/genetics; G1 Phase/physiology; Gene Expression Regulation, Leukemic; Gene Expression Regulation, Neoplastic; Humans; Lymphoma, T-Cell/enzymology; Lymphoma, T-Cell/pathology; Mice; Mice, Inbred C57BL; NF-kappa B/metabolism; Phosphorylation/physiology; Precursor Cell Lymphoblastic Leukemia-Lymphoma/pathology; Promoter Regions, Genetic/physiology; Proto-Oncogene Proteins/genetics; Proto-Oncogene Proteins/metabolism; Receptor, Notch1/genetics; Receptor, Notch2/genetics; Receptor, Notch2/metabolism; Receptor, Notch3; Receptor, Notch4; Receptors, Notch/genetics; Receptors, Notch/metabolism; Retinoblastoma Protein/metabolism; S Phase/physiology; Signal Transduction/physiology