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Fig. 1. Spectral absorbance curves from the four single-cone photoreceptor cell types found in the dwarf wrymouth, Lyconectes aleutensis. Each absorbance curve was normalized to the {lambda}max of the best-fitting template curve (filled circles connected by a solid line). {lambda}max of visual pigments of cones sensitive in the yellow (P570), green (P512), violet (P406) and ultraviolet (P360) regions of the spectrum are indicated (arrows). The noise in each recording is typical of that obtained for all the other species examined.