Abstract
As well as rods, there are generally three or four morphological classes of cone cells in the retinae of non-mammalian vertebrates. They are commonly distinguished as single or double cones, and they differ in other more subtle anatomical respects. Microspectrophotometric analysis of the goldfish retina1 suggested that the red and green photopic visual pigments are located in the separate elements of the twin cones in this species, and the blue one in the single cones. More recently2, in the frog, it has been confirmed that the different pigments are segregated into the different retinal receptor types.
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