| http://www.w3.org/ns/prov#value | - The peptide of claim 4, which comprises the sequence (SID No. 11): H2N???X5???X4???X3???X2???X1???COOH where X1 is an amino acid of the formula (I) where at least one R group is ???SO2X, where X is ???OR??? or ???NR???R??????; R??? is hydroxy, amino, or thiol; R??? is C1-6 alkyl; R?????? is hydrogen or alkyl; and n is 1, 2 or 3; X2 and X3 are each, independently, amino acids which together form a
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