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perception as light dims). The ratio of rods to cones varies across species as well as in different areas of their respective retinas and is related to their adaptations, but the cells function in a similar manner from species to species. UV-sensitive vision in vertebrates is generally a separate phenomenon, although it involves related genes and mechanism (Yokoyama 2000; Yokoyama and Yokoyama 2000).

outer segment inner segment cell body synaptic ending outer segment inner segment cell body synaptic ending

Figure 14-2. Continued

Cone

Figure 14-2. Continued

Cone

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