title: A comparison of the effects of morphine withdrawal, thyroxine or thyroidectomy on the sensitivity of the anococcygeus muscle to agonists and on serum thyroxine levels in the rat.
mesh_terms: D000818:Animals; D008297:Male; D009021:Morphine Dependence / Q000503:physiopathology*; D009132:Muscles / Q000187:drug effects*; D051381:Rats; D011919:Rats, Inbred Strains; D013375:Substance Withdrawal Syndrome / Q000503:physiopathology*; D013965:Thyroidectomy; D013974:Thyroxine / Q000097:blood / Q000494:pharmacology*
chemical_list: D013974:Thyroxine