title: Changes in DNA and collagen content in rat testes during aging.
mesh_terms: D000375:Aging; D000818:Animals; D003094:Collagen / Q000378:metabolism*; D004247:DNA / Q000378:metabolism*; D008297:Male; D009929:Organ Size; D051381:Rats; D013737:Testis / Q000378:metabolism* / Q000502:physiology
chemical_list: D003094:Collagen; D004247:DNA