title: Variation in serum levels of thyroxine in anadromous larval lampreys, Petromyzon marinus L.
mesh_terms: D000818:Animals; D005260:Female; D005399:Fishes / Q000097:blood*; D007798:Lampreys / Q000097:blood* / Q000378:metabolism; D007814:Larva; D008297:Male; D008675:Metamorphosis, Biological; D012621:Seasons; D012737:Sex Factors; D013974:Thyroxine / Q000097:blood*
chemical_list: D013974:Thyroxine