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The incorporation of noncanonical (unnatural) amino acids into proteins offers researchers the ability to augment the biochemical functionality of proteins for a myriad of applications including bioorthogonal conjugation, biophysical and structural studies, and the enhancement or de novo creation of novel enzymatic activities. The augmentation of a protein throughout its coding sequence by global residue-specific incorporation of unnatural amino acid analogs is an attractive technique for studying both the utility of individual chemistries available through unnatural amino acids and the general effects of unnatural amino acid substitution on protein structure and function. Herein we describe protocols to introduce unnatural amino acids into proteins using the
Escherichia coli
translation system either in vivo or in vitro. Special attention is paid to obtaining high levels of incorporation while maintaining high yields of protein expression.