Respiratory effects of enkephalin.
D000818:Animals; D002319:Cardiovascular System / Q000187:drug effects; D004723:Endorphins / Q000494:pharmacology*; D004745:Enkephalins / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D051381:Rats; D012119:Respiration / Q000187:drug effects*
D004723:Endorphins; D004745:Enkephalins