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Protein: Reviewed by Neal Henderson MS CSCS February 01, 2007 by First Endurance - Robert Kunz View Printable Version More by this Author

Introduction: A protein is any one of a large number of organic compounds that make up living organisms and are essential to their functioning. First discovered in 1838, proteins are now recognized as predominant ingredients of cells, making up more than 50 percent of the dry weight of animals. The word protein is coined from the Greek proteios, or "primary."

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