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In this undated photo provided by the California National Primate Research Center, rhesus monkeys are seen in their outdoor enclosure at the California National Primate Research Center in Davis, Calif. A group of the animals exposed to wildfire smoke as infants have developed lungs that are about 20 percent smaller than other rhesus monkeys. (CNPRC/Univeristy California Davis via AP)

In this undated photo provided by the California National Primate Research Center, rhesus monkeys are seen in their outdoor enclosure at the California National Primate Research Center in Davis, Calif. A group of the animals exposed to wildfire smoke as infants have developed lungs that are about 20 percent smaller than other rhesus monkeys. (CNPRC/Univeristy California Davis via AP)

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