| http://www.w3.org/ns/prov#value | - Particularly preferred for use in these methods are the compounds particularly provided herein of formulae (I) and (II) but with the proviso that, when the compounds have formula (I): (1) at least one of the amino acid residues in the resulting tripeptide is a non-naturally-occurring ??-amino acid or at least one of the R1, R3 and R5 is not a side chain of a naturally-ocurring amino acid; and (2)
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