Reduction of the spermatogonial population in rat testes flown on Space Lab-3.
D000818:Animals; D008297:Male; D009929:Organ Size; D051381:Rats; D013026:Space Flight; D013076:Sperm Count; D013093:Spermatogonia / Q000166:cytology; D013737:Testis / Q000166:cytology*