Chimp 099 is shown with her daughter in Gombe National Park, Tanzania, in this March 7, 2006, handout photo provided by Nature magazine. Ch-099, first sampled in 2003, was infected with SIVcpz from the onset of the study. She died in November 2006 from complications of a spinal cord injury. Her body, recovered shortly after her death, was one of three bodies of SIVcpz-infected chimpanzees that were subject to post-mortem analysis.

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