Is there a single cell code for background light levels?
D000818:Animals; D003624:Darkness; D008027:Light; D008636:Mesencephalon / Q000502:physiology*; D011817:Rabbits; D013477:Superior Colliculi / Q000502:physiology; D013997:Time Factors; D014794:Visual Fields; D014795:Visual Pathways / Q000502:physiology*; D014796:Visual Perception