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

related
terms:

amino acids, cell, gene, gene amplification

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