Antigens, Ly/metabolism; Apoptosis; Cell Lineage; Hematopoietic Stem Cells/pathology; Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology; Membrane Proteins/metabolism; Neoplastic Stem Cells/pathology; Proto-Oncogene Proteins c-kit/metabolism; Animals; Antigens, CD/metabolism; Apoptosis/drug effects; Apoptosis/radiation effects; Arachidonate 5-Lipoxygenase/metabolism; Benzamides; Cell Lineage/drug effects; Cell Lineage/radiation effects; Cell Survival/drug effects; Cell Survival/radiation effects; Fluorouracil/pharmacology; Fusion Proteins, bcr-abl/metabolism; Gamma Rays; HSP90 Heat-Shock Proteins/metabolism; Hematopoietic Stem Cells/drug effects; Hematopoietic Stem Cells/metabolism; Hematopoietic Stem Cells/radiation effects; Imatinib Mesylate; Interferon Regulatory Factors/metabolism; Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy; Mice; Neoplastic Stem Cells/drug effects; Neoplastic Stem Cells/metabolism; Neoplastic Stem Cells/radiation effects; Piperazines/pharmacology; Piperazines/therapeutic use; Pyrimidines/pharmacology; Pyrimidines/therapeutic use; Receptors, Cell Surface/metabolism; Signal Transduction/drug effects; Signal Transduction/radiation effects; Signaling Lymphocytic Activation Molecule Family Member 1; Time Factors; src-Family Kinases/metabolism