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Figure 4


Fig. 4. Calculated relative quantal spectral sensitivity functions for the outer segment of cones containing pigmented oil droplets in 33-week-old adult chickens reared in bright (solid line) or dim (broken line) light. (A) C-type oil droplets in the short-wavelength-sensitive single cones; (B) Y-type oil droplets in the medium-wavelength-sensitive single cones; (C) R-type oil droplets in the long-wavelength-sensitive (LWS) single cones and (D) P-type oil droplets in the principal member of the LWS double cones. Note the increased sensitivity and spectral bandwidth of all cone types in the dim-light group, owing to the reduced density of carotenoid pigments in their respective oil droplet types, compared with that of the bright-light group (see Figs 2, 3).





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