| http://www.w3.org/ns/prov#value | - More particularly, in accordance with the present invention, X is selected from one of the following possibilities: a direct bond to a bioactive molecule; a linear alkyl C1 -C30 chain, terminated by COOH, NH2, OH, SH or other functional groups chosen to permit covalent linking to a bioactive molecule; a linear chain consisting of 1-20 atoms of C interspersed with 1-10 atoms of N, O or S, terminate
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