CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Illustration comparing Chimpanzee microRNA (upper left) and human miR-941 (lower right), a gene that appears unique to humans and may have played a crucial role in brain development. It appears to have emerged between six and one million years ago. Yellow=guanine, blue=adenine, cyan=cytosine, red=thymine.
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