#visual_purple__rhodopsin__retinal_purple__retinalpurple  a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
  supertype:  photopigment  a special pigment found in the rods and cones of the retina
  substance:  opsin  retinene
  part of:  retinal_rod__retinalrod__rod__rodcell  visual receptor cell sensitive to dim light
     part of:  retina  the light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve
        part of:  eye__oculu__optic__peeper  the organ of sight (`peeper' is an informal term for `eye')
           part of:  visual_system  the sensory system for vision
           part of:  human_face__humanface  the front of the head from the forehead to the chin and ear to ear; "he washed his face"; "I wish I had seen the look on his face when he got the news"
              part of:  head__caput  the upper or front part of the body in animals; contains the face and brains; "he stuck his head out the window"
                 part of:  animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement

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