Abstract
Measurement of the early receptor potential action spectra of the dorsal and ventral areas of the Rana catesbeiana retina indicates that there are at least two long-wave cone pigments in this retina and that these pigments are not homogeneously distributed. We suggest that the ventral retina contains predominantly an A 1-based cone pigment absorbing maximally at 580 nm and that the dorsal retina contains a mixture of this A 1-based pigment and an A 2-based pigment absorbing maximally at 620 nm.
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