yes - its one of several "regional primate centers" originally opened in the 60s because monkeys and chimps were thought to be good models for humans.
when AIDS appeared in the 80s, the centers overbred chimpanzees but it turns out that when injected with HIV, they never manifested any of the symptoms of AIDS, and therefore not good models. so in the 90s there was a bill in Congress to retire the "surplus" chimps. at the end of his term, Clinton signed the CHIMP act:
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www.saplonline.org]
regardless. there are still many chimps and monkeys at suffering at Yerkes as they undergo invasive, terminal experiments.
they also conduct non-invasive, behavioral research.