| http://www.w3.org/ns/prov#value | - amino, halogen, cyano, carboxylic acid, NH(CH2)m OH where m is 2 to 20, succinimidoxy, biotin and carboxyfluorescein substituents, wherein R1 is a linking substituent selected from the group consisting of a --(CH2)n group, a --(CH2)n NH-- group and a --(CH2)n CO-- group, where n is an integer between about 1 and 30, wherein X is a chemically labile substituent which is removed by an activating ag
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