| http://www.w3.org/ns/prov#value | - rt matrix represented by the formula: wherein, R^ , R4' , R and Rg is H or a spacer formed from the reaction of a member selected from the group consisting of allyloxymethyl, alkylthio, alkylamino, carboxy, carboxyalkyl and epoxyalkyl 25 with an Si (X) (X) moiety used for attachment to ???O???Matrix, R7 is a member selected from the group consisting of H, or alkyl, Z is a ??? member selected from
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