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No signs of illness

Quantum dots that contain cadmium, selenium and zinc are not toxic to monkeys for periods of up to 90 days, but longer-term studies are needed to determine the ultimate fate of the heavy metals that accumulate in the organs.

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Correspondence to Warren C. W. Chan.

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Chou, L., Chan, W. No signs of illness. Nature Nanotech 7, 416–417 (2012).

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