The X-Mice

March 30, 2007 | Source: Technology Review

Researchers from Johns Hopkins University and the University of California, Santa Barbara genetically engineered mice to express a third, humanlike photoreceptor, giving them human color vision.

Can they do the same for humans? Turns out some people may actually have a fourth photoreceptor that detects light within the visible range at a slightly different wavelength range than the other three.