Feedback loop between cones and horizontal cells in the turtle retina.
D000200:Action Potentials; D000818:Animals; D003118:Color Perception; D005246:Feedback; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000166:cytology / Q000502:physiology*; D012160:Retina / Q000166:cytology* / Q000502:physiology; D014426:Turtles