Cell Transformation, Neoplastic/genetics; Drug Resistance, Neoplasm; Hematopoietic Stem Cells/pathology; Lymphoma/drug therapy; Lymphopoiesis; Proto-Oncogene Proteins c-bcl-2/genetics; Up-Regulation; Animals; Antineoplastic Agents, Alkylating/pharmacology; Antineoplastic Agents, Alkylating/therapeutic use; Apoptosis Regulatory Proteins/metabolism; Autoimmunity; Bcl-2-Like Protein 11; Cell Survival; Cyclophosphamide/pharmacology; Cyclophosphamide/therapeutic use; Hematopoiesis; Hematopoietic Stem Cells/cytology; Hematopoietic Stem Cells/metabolism; Humans; Lymphocytes/cytology; Lymphocytes/metabolism; Lymphocytes/pathology; Lymphoma/genetics; Lymphoma/pathology; Membrane Proteins/metabolism; Mice; Mice, Inbred C57BL; Mice, Transgenic; Myeloid Cell Leukemia Sequence 1 Protein; Myeloid Cells/cytology; Myeloid Cells/metabolism; Myeloid Cells/pathology; Proto-Oncogene Proteins/metabolism; Proto-Oncogene Proteins c-bcl-2/metabolism; Proto-Oncogene Proteins c-myc/metabolism