Developmental differences between high and low affinity opiate binding sites: their relationship to analgesia and respiratory depression.
D000375:Aging; D000700:Analgesics; D000818:Animals; D001921:Brain / Q000378:metabolism; D007700:Kinetics; D008297:Male; D009020:Morphine / Q000494:pharmacology*; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism*; D012119:Respiration / Q000187:drug effects*
D000700:Analgesics; D011957:Receptors, Opioid; D009020:Morphine