title: Hydration of retinal and the nature of metarhodopsin II.
mesh_terms: D006860:Hydrogen Bonding; D007536:Isomerism; D009038:Motion; D012168:Retinal Pigments; D012172:Retinaldehyde; D012243:Rhodopsin; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D014801:Vitamin A / Q000031:analogs & derivatives; D014867:Water
chemical_list: D012168:Retinal Pigments; D014867:Water; D014801:Vitamin A; D012243:Rhodopsin; D012172:Retinaldehyde