title: Ontogeny of opiate receptor sites in brain: apparent lack of low affinity sites during early neonatal life.
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000378:metabolism*; D001665:Binding Sites; D001921:Brain / Q000378:metabolism*; D066298:In Vitro Techniques; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism*; D013997:Time Factors
chemical_list: D011957:Receptors, Opioid