| http://www.w3.org/ns/prov#value | - Preferably, the trifunctional linker is chain-like and has the general formula: ##STR2## wherein n and m independently areintegers from 1 to about 30; p is an integer from 0 to about 30; G is H or a protecting group; and X and Y are independently selected from the group consisting of hydroxyl, amino, thiol and carboxyl.
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