Green fluorescent protein absorbs this blue and re-emits it as a green glow.

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Blue Gene could simulate heating a protein, to see how stable it is, or could apply random mutations to a protein, to see how its ability to fold is affected.

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Researchers have not yet chosen which protein they will fold when Blue Gene is finished a few years down the road, but Horn said that simple proteins will be tested before then.

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The protein now comes in yellow and blue varieties.

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