title: Diurnal variation in plasma testosterone of the male laboratory rat.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D008297:Male; D011863:Radioimmunoassay; D051381:Rats; D013739:Testosterone / Q000097:blood* / Q000378:metabolism; D013997:Time Factors; D014316:Tritium
chemical_list: D014316:Tritium; D013739:Testosterone