Chemical modification of proteins: comments and perspectives*

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Abstract
The use of chemical modification of proteins has increased exponentially during the past two decades. Today the many different uses of chemical modification include determination of relative reactivities of side chain groups, the quantitation of individual amino acids, development of affinity reagents, mechanism-based reagents for pharmaceutical uses, cross-linking reagents, special techniques for bioprostheses, blocking reagents for peptide synthesis, and reagents for specific cleavages of peptide bonds. Chemical modification should continue to be a primary tool in protein chemistry. It can supply information or products difficult or impossible to attain by the newer powerful technique of in vitro mutagenesis as well as serve as a supplementary procedure for the latter.