Human/Chimp difference

From EurekaAlert:

Approximately 6 percent of human and chimp genes are unique to those species, report scientists from Indiana University Bloomington and three other institutions. The new estimate, reported in the inaugural issue of Public Library of Science ONE (Dec. 2006), takes into account something other measures of genetic difference do not -- the genes that aren't there.

That isn't to say the commonly reported 1.5 percent nucleotide-by-nucleotide difference between humans and chimps is wrong, said IUB computational biologist Matthew Hahn, who led the research. IUB postdoctoral researcher Jeffery Demuth is the paper's lead author.

"Both estimates are correct in their own way," Hahn said. "It depends on what you're asking. There isn't a single, standard estimate of variation that incorporates all the ways humans, chimps and other animals can be genetically different from each other."

Update: RPM offers some background.

Update (12/21): The paper is now online.