Lymphocyte development.
D000818:Animals; D017209:Apoptosis / Q000502:physiology; D001402:B-Lymphocytes / Q000502:physiology*; D006801:Humans; D007158:Immunologic Techniques; D013601:T-Lymphocytes / Q000502:physiology*; D013950:Thymus Gland / Q000166:cytology / Q000196:embryology