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In Focus

Crystal in the Sky

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The best place to observe the building blocks of the human body might be in outer space.

Proteins are large, complex molecules that carry out most of the odd jobs around the human body. Antibodies fight off foreign viruses and bacteria, and hormones transmit signals between organs and tissues. Enzymes facilitate chemical reactions in cells, and hemoglobin carries oxygen around the body. All of these are among the 100,000 types of proteins that busily keep h...

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In Depth

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Dispatches

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From Mass General

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Charts & Data

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