#retinal_rod__retinalrod__rod__rodcell  visual receptor cell sensitive to dim light
  supertype:  #visual_cell  one of the cells of the retina that is sensitive to light
  part of:  #retina
  part:  #visual_purple__rhodopsin__retinal_purple__retinalpurple  a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light

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