Science: Protein Puzzle

One way scientists hope to learn more about the mysteries of the human body is by analyzing the structure of proteins, of which the vital parts of all living creatures are made. The job is complicated by the fact that the typical protein molecule is built up of hundreds or thousands of amino-acid-units which link together in complex ways. They form long chains, they branch, they tangle, they join together in rings. Even to identify the amino acids in a simple protein is a difficult task for the most skillful chemist. To figure how...

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