title: Conformational features of the opioid peptides in the solid state: a review of X-ray crystallographic research.
mesh_terms: D004723:Endorphins; D004743:Enkephalin, Leucine; D004745:Enkephalins / Q000494:pharmacology; D008958:Models, Molecular; D011487:Protein Conformation; D013329:Structure-Activity Relationship; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D004723:Endorphins; D004745:Enkephalins; D004743:Enkephalin, Leucine