title: A unifying presentation of photopigment spectra.
authors.forename: E F
authors.initials: EF
authors.lastname: MacNichol
mesh_terms: D000818:Animals; D003118:Color Perception / Q000502:physiology; D049673:History, 20th Century; D010786:Photoreceptor Cells / Q000502:physiology; D011898:Ranidae; D012160:Retina / Q000502:physiology; D012168:Retinal Pigments / Q000502:physiology*; D013053:Spectrophotometry
chemical_list: D012168:Retinal Pigments