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Does missing gene point to nocturnal existence for early mammals?

ide clues as to the implications of only having one melanopsin gene.

"The two genes and their associated proteins have been maintained in vertebrates for hundreds of millions of years, only for one of them to be lost in mammals.

"We are keen to discover why this might have happened ?perhaps the early mammals were at one stage nocturnal and had no need for the second gene, for instance. We also want to find out what losing one of these genes means for humans."
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Source:University of Manchester


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