**Protein Limitation Explains Variation in Primate Colour Vision Phenotypes: A Unified Model for the Evolution of Primate Trichromatic Vision**

Kim Valenta1 and Amanda D. Melin2

*1University of Toronto, Department of Anthropology, Toronto, Ontario, 2Dartmouth College, Department of Anthropology, Hanover, New Hampshire, 1Canada 2USA* 
