Abstract
1. 1. The eyes of the summer-type crayfish contained only retinal and showed only one class of spectral sensitivity curve. 2. 2. The eyes of the winter-type crayfish contained both retinal and 3-dehydroretinal and showed four patterns of spectral sensitivity. 3. 3. Selective light adaptation of the crude rhabdome preparations showed that the visual pigment with retinal as a chromophore absorbed light of shorter wavelength than that absorbed by visual pigment with 3-dehydroretinal. 4. 4. These results suggest that the synthesis of a different opsin accompanied reactions involving 3-dehydroretinal.
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