title: Conformation of cyclic analogs of enkephalin. II. Analogs containing a cystine bridge.
mesh_terms: D003553:Cystine; D004745:Enkephalins; D008958:Models, Molecular; D010456:Peptides, Cyclic; D011487:Protein Conformation
chemical_list: D004745:Enkephalins; D010456:Peptides, Cyclic; D003553:Cystine