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defined:
A large complex molecule made up of one or more chains of amino acids. Proteins perform a wide variety of activities in the cell.
explained:
Listen to a detailed explanation. (Requires the free RealPlayer download) Dr. Lawrence Brody, of the National Human Genome Research Institute's Genetic and Molecular Biology Branch, defines protein.
illustrated:
View illustration
relatedterms:
amino acids, cell, gene, gene amplification
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