title: The structure of visual pigments. I. Carbon-13 nuclear magnetic resonance spectroscopy of N-all-trans-retinylidenepropylimine and its protonated species.
mesh_terms: D004735:Energy Transfer; D007553:Isotope Labeling; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D011437:Propylamines; D011522:Protons; D012168:Retinal Pigments; D012172:Retinaldehyde; D012243:Rhodopsin; D012545:Schiff Bases
chemical_list: D011437:Propylamines; D011522:Protons; D012168:Retinal Pigments; D012545:Schiff Bases; D012243:Rhodopsin; D012172:Retinaldehyde