| http://www.w3.org/ns/prov#value | - X is selected from the group consisting of reactive functional groups including hydroxyl groups and esters thereof, carboxylic acid groups, thiocarboxylic acid groups, thiocarboxylic and carboxylic esters, lower alkyl esters of from one to about 12 carbon atoms, such as methyl and ethyl esters, acyl halides such as chlorides, isocyanates, acyl azides, acetyl groups, trihaloacetyl groups, primary o
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