Biochemical changes in the reproductive cycle.
D005260:Female; D005836:Genitalia, Female / Q000378:metabolism*; D006801:Humans; D007246:Infertility / Q000209:etiology*; D008297:Male; D012098:Reproduction; D013094:Spermatozoa / Q000378:metabolism*
GENITALIA, FEMALE/metabolism; SPERMATOZOA/metabolism; STERILITY/etiology