| http://www.w3.org/ns/prov#value | - For example, in the case of targeting ligands comprising the tripeptide RGD, flanking amino acids may be added to form (X)n-RGD-(Y)n where n is an integer of from about 1 to about 100 and X and Y may be any natural or synthetic amino acid and, with the proviso that at least one of the involved amino acids is cysteine or an analog such as penicillamine.
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