| http://www.w3.org/ns/prov#value | - In a third embodiment of the second aspect of the present invention, a targeting substance is attached to a diagnostic or therapeutic agent through use of a stabilized Schiff base/hydrazone linker, forming targeting substance conjugates as depicted below. ##STR19## In the above schematics, TS is a targeting substance and agent is a diagnostic or therapeutic agent attached either directly or in
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