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Most birds and fish have retained the four ancestral opsin genes (39), with notable opsin expansions in cichlid fish opsins (23, 40), whereas SWS1 is extinct in monotremes, and SWS2 and M opsins are ...

1 Food Systems, Nutrition and Health Program, School of Public Health, University of Washington, Seattle, WA, United States 2 Center for Public Health Nutrition, University of Washington, Seattle, WA, ...