title: Failure to identify a spermatogonial chalone in adult irradiated testes.
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002455:Cell Division; D003037:Cobalt Radioisotopes; D004247:DNA / Q000096:biosynthesis; D006131:Growth Inhibitors / Q000494:pharmacology*; D008297:Male; D051381:Rats; D013093:Spermatogonia / Q000166:cytology / Q000187:drug effects* / Q000528:radiation effects; D013094:Spermatozoa / Q000187:drug effects*; D013737:Testis / Q000378:metabolism / Q000528:radiation effects
chemical_list: D003037:Cobalt Radioisotopes; D006131:Growth Inhibitors; D004247:DNA