Does the Nature paper discuss the inactivation in terms of pseudogenes?
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http://www.nytimes.com/2005/09/01/science/01chimp.html
In Chimpanzee DNA, Signs of Y Chromosome's Evolution
By NICHOLAS WADE
Scientists have decoded the chimp genome and compared it with that of
humans, a major step toward defining what makes people human and developing
a deep insight into the evolution of human sexual behavior.
The comparison pinpoints the genetic differences that have arisen in the two
species since they split from a common ancestor some six million years
ago....
