title: The origin and development of lymphocytes.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology; D001854:Bone Marrow Cells; D002454:Cell Differentiation; D006412:Hematopoietic Stem Cells / Q000166:cytology; D008214:Lymphocytes / Q000166:cytology*; D013601:T-Lymphocytes / Q000166:cytology; D013950:Thymus Gland / Q000166:cytology