| http://www.w3.org/ns/prov#value | - wherein Ab is an antibody, m=1 to 50 (such as m=2 to 30, m=3 to 20 or n=4 to 12) and k=1 to 10 (such as k=2 to 6 or kj=3 to 4) and X is again a spacer group, for example, a spacer group having between 1 and 10 carbon atoms, such as between 1 and 6 carbons or between 1 and 4 carbons, and optionally containing one or more amide linkages, ether linkages, ester linkages, amine linkages and the like.
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