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some work with chimp embryos. It didn’t lead anywhere. In fact, he had hardly gotten started before the encephalitis outbreak halted his research. He ended up back at Bethesda and working in a lab for the duration of his sabbatical.
    That was all he knew.
    At least, all he knew for sure.
    HUMANS AND CHIMPS INTERBRED UNTIL RECENTLY
    Species Split Did Not End Sex, Researchers Find a Controversial Result from Genetics
    R esearchers at Harvard and MIT have concluded that the split between humans and chimpanzees occurred more recently than previously thought. Gene investigators had long known that apes and human beings both derived from a common ancestor, who walked the earth some 18 million years ago. Gibbons split off first, 16 million years ago. Orangutans split about 12 million years ago. Gorillas split 10 million years ago. Chimpanzees and human beings were the last to split, about 9 million years ago.
    However, after decoding the human genome in 2001, geneticists discovered that human beings and chimps differed in only 1.5% of their genes—about 500 genes in all. This was far fewer than expected. By 2003, scientists had begun to catalog precisely which genes differed between the species. It is now clear that many structural proteins, including hemoglobin and cytochrome c proteins, are identical in chimps and humans. Human and chimp blood are identical. If the species split 9 million years ago, why are they still so alike?
    Harvard geneticists believe humans and chimpanzees continued to interbreed long after the species split. Such interbreeding, or hybridization, puts evolutionary pressure on the X chromosome, causing it to change more rapidly than normal. The researchers found that the newest genes on the human genome appear on the X chromosome.
    From this, researchers argue that ancestral humans continued to breed with chimps until 5.4 million years ago, when the split became permanent. This new view stands in sharp contrast to the consensus view that once speciation occurs, hybridization is “a negligible influence.” But according to Dr. David Reich of Harvard, the fact that hybridization has rarely been seen in other species “may simply be due to the fact that we have not been looking for it.”
    The Harvard researchers caution that interbreeding of humans and chimpanzees is not possible in the present day. They point out that press reports of hybrid “humanzees” have invariably proven false.

CH006
    B ioGen Research Inc. was housed in a titanium-skinned cube in an industrial park outside Westview Village in Southern California. Majestically situated above the traffic on the 101 Freeway, the cube had been the idea of BioGen’s president, Rick Diehl, who insisted on calling it a hexahedron. The cube looked impressive and high-tech while revealing absolutely nothing about what went on inside—which is exactly how Diehl wanted it.
    In addition, BioGen maintained forty thousand square feet of nondescript shed space in an industrial park two miles away. It was there that the animal storage facilities were located, along with the more dangerous labs. Josh Winkler, an up-and-coming young researcher, picked up rubber gloves and a surgical mask from a shelf by the door to the animal quarters. His assistant, Tom Weller, was reading a news clipping taped to the wall.
    “Let’s go, Tom,” Josh said.
    “Diehl must be crapping in his pants,” Weller said, pointing to the article. “Have you read this?”
    Josh turned to look. It was an article from the Wall Street Journal :
    SCIENTISTS ISOLATE “MASTER” GENE
    A Genetic Basis for Controlling Other People?
    TOULOUSE, FRANCE —A team of French biologists have isolated the gene that drives certain people to attempt to control others. Geneticists at the Biochemical Institute of Toulouse University, headed by Dr. Michel Narcejac-Boileau, announced the discovery at a press conference today. “The gene,” Dr. Narcejac-Boileau said, “is associated with social