TY - GEN AU - Weissman,I L TI - Developmental switches in the immune system SN - 0092-8674 PY - 1994///0302 KW - Animals KW - Cell Death KW - Cell Differentiation KW - Gestational Age KW - Hematopoiesis KW - Hematopoietic Stem Cells KW - cytology KW - Humans KW - Immunity KW - Immunity, Cellular KW - Lymphoid Tissue KW - Receptors, Lymphocyte Homing KW - physiology KW - Thymus Gland N1 - Publication Type: Journal Article; Review UR - https://doi.org/10.1016/0092-8674(94)90329-8 ER -