The spectral clustering of visual pigments.

Evidence is presented that the λmax of visual pigments are not distributed uniformly throughout the spectrum but, on the contrary, are clustered around certain discrete positions. Eight of these positions for the A1 pigments have been determined from a consideration of published data and a comparably large amount of new data presented here for the first time. These positions are 478.5, 486.5, 493, 501, 506, 511.5, 519 and 528 nm. The relationship between A1 and A2 pigments, and the structural implications of the clustering phenomenon, are discussed.

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