NEW YORK, Sept. 18 -- Rockefeller University posted the following news:

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Scientists discover why high levels of the amino acid cysteine are toxic to cells

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Cysteine is one of the main building blocks that cells use to make proteins. But this amino acid is a double-edged sword-too much cysteine is toxic to the cell. Cells therefore keep free cysteine levels to a minimum, converting most of the amino acid into the antioxidant glutathione.

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