title: Studies on T-cell precursors.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000276:immunology*; D001854:Bone Marrow Cells; D002455:Cell Division; D007621:Karyotyping; D051379:Mice; D008808:Mice, Inbred CBA; D009929:Organ Size; D011828:Radiation Chimera; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000166:cytology