Cellular proliferation and density in relation to age involution of the rat thymus.
D000375:Aging; D000818:Animals; D002455:Cell Division; D004847:Epithelial Cells; D008297:Male; D051381:Rats; D013601:T-Lymphocytes / Q000166:cytology*; D013950:Thymus Gland / Q000166:cytology*