VandeBerg says he and his colleagues go out of their way to use lower forms of animals before experimenting on chimpanzees.
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Vandeberg also defends his research facility, saying that the animals in his primate research center receive better care than most people in the world.
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But the legislation is not to everyone's liking. John VandeBerg, director of the Southwest National Primate Research Center in San Antonio,Texas, says the use of chimpanzees in biomedical research is essential.