title: Opioid peptides in the guinea pig ileum.
mesh_terms: D000818:Animals; D004723:Endorphins / Q000378:metabolism*; D004745:Enkephalins / Q000378:metabolism; D006168:Guinea Pigs; D007082:Ileum / Q000378:metabolism*; D066298:In Vitro Techniques; D008970:Molecular Weight; D009130:Muscle, Smooth / Q000378:metabolism; D009197:Myenteric Plexus / Q000378:metabolism
chemical_list: D004723:Endorphins; D004745:Enkephalins