| http://www.w3.org/ns/prov#value | - or biologically acceptable salts or pro-reporter molecules (such as methyl ester form of carboxyl-containing amino acid residues) thereof, wherein x and z is the same or different and is a peptide or amino acid or acyl group or other structure such that Formula I is a substrate for caspases, or other proteases or peptidases or other enzymes; and wherein the scissile bond is only one or both of the
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