title: Some principles in the peptide field.
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001812:Blood-Brain Barrier; D001921:Brain / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004723:Endorphins / Q000037:antagonists & inhibitors / Q000502:physiology; D005260:Female; D008297:Male; D010455:Peptides / Q000097:blood / Q000378:metabolism / Q000494:pharmacology / Q000502:physiology*; D049590:Postpartum Period; D011247:Pregnancy; D051381:Rats
chemical_list: D004723:Endorphins; D010455:Peptides