| http://www.w3.org/ns/prov#value | - Xaa1 is naturally or nonnaturally occurring amino acid comprising an imidazole or thiazole ring, such as histidine or thiazolylalanine; wherein any of the carbon atoms of said amino acid are optionally substituted with hydrogen, with one or more alkyl groups, or with one or more halo groups; wherein the free amino group of said amino acid is optionally substituted hydrogen, hydroxyl, alkyl, acyl,
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