Vision. 4. Chemicals in the retina which initiate vision.
D000818:Animals; D006801:Humans; D011323:Primates; D012160:Retina / Q000502:physiology*; D012168:Retinal Pigments / Q000502:physiology*; D012243:Rhodopsin / Q000502:physiology*; D014785:Vision, Ocular
D012168:Retinal Pigments; D012243:Rhodopsin