Brain Evoluntion Stabilizing

More discussion on how parts of the genome evolve at different rates.

Science & Technology at Scientific American.com: Genes Expressed in Brain Evolving at a Medium Pace -- Even mice brains evolve faster than human brains, and our complexity may be the culprit: "'We found that genes expressed in the human brain have in fact slowed down in their evolution, contrary to some earlier reports,' states Chung-I Wu, an evolutionary biologist at the University of Chicago and the co-author of a study appearing in the most recent issue of PLoS Biology. 'The more complex the brain, it seems, the more difficult it becomes for brain genes to change.'"