title: Implications of torsional potential of retinal isomers for visual excitation.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007536:Isomerism; D012168:Retinal Pigments / Q000737:chemistry*; D012172:Retinaldehyde / Q000737:chemistry*
chemical_list: D012168:Retinal Pigments; D012172:Retinaldehyde