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The rudimentary eyes of the mole rat Spalax ehrenbergi have lost their visual function, but are still required for the control of circadian rhythms. It has previously been found that αA-crystallin, a major eye lens protein in other mammals, evolved much faster in the mole rat than in rodents with normal vision. Yet, although mole rat αA-crystallin seems superfluous as a lens protein, its rate of change...
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