| http://www.w3.org/ns/prov#value | - Protecting groups which can be used include: 1) alkyl esters such as methyl and t-butyl, 2) aryl esters suchas benzyl and substituted benzyl, or 3) esters which can be cleaved by mild base treatment or mild reductive means such as trichloroethyl and phenacyl esters.The .alpha.-amino group of each amino acid to be coupled to the growing peptide chain must be protected.
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