title: Determination of serum thyroxine in two species of toads: variation with season.
mesh_terms: D000818:Animals; D002023:Bufo bufo / Q000097:blood; D002025:Bufonidae / Q000097:blood*; D005260:Female; D008297:Male; D012621:Seasons; D013045:Species Specificity; D013974:Thyroxine / Q000097:blood*
chemical_list: D013974:Thyroxine