| http://www.w3.org/ns/prov#value | - In certain embodiments, the polypeptide comprises a protecting group coupled to the amino terminal and the amino terminal protecting group is a protecting group such as a benzoyl group, an acetyl, a propeonyl, a carbobenzoxy, a propyl, a butyl, a pentyl, a hexyl, or a 3 to 20 carbon alkyl.
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