title: A new class of endogenous peptide factors.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D001923:Brain Chemistry; D002415:Cats; D004285:Dogs; D006168:Guinea Pigs; D008297:Male; D010455:Peptides / Q000134:cerebrospinal fluid / Q000494:pharmacology*; D011817:Rabbits; D051381:Rats; D013045:Species Specificity; D013116:Spinal Cord / Q000187:drug effects / Q000502:physiology*
chemical_list: D010455:Peptides