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n :  any of the three-dimensional subunits of a protein that together make up its tertiary structure, that are formed by folding its linear peptide chain, and that are variously considered to be the basic units of protein structure, function, and evolution <immunoglobulin light chains have two s and heavy chains have four or five s, depending on class -Jour. Amer. Med. Assoc.>  .
Similar sounding terms:  di·amine  di·ami·no 

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