| 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 is a peptide, amino acid or other structure such that compounds of Formula I is a substrate for a caspase or other proteases or peptidases or other enzymes; and wherein X-Y is a scissile bond.
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