Defense against Ancient Virus Opened Door to HIV

sciam.com — Early humans successfully fended off a virus that infected chimpanzees by evolving a protein capable of neutralizing it, according to a new study. But what goes around comes around, evolutionarily speaking: Four million years later, the same protein seems to have left us more vulnerable than other primates to the human immunodeficiency virus (HIV). Jun 21, 2007 View in Crawl 4