| http://www.w3.org/ns/prov#value | - The coupling agents of this invention may be represented by the following formulas: ##STR1## wherein E is a group capable of reacting with a site on the protein; L is an organic linking radical which may contain a cleavable site; R and R' are independently hydrogen or lower alkyl; m, n, p and q are integers which are independently selected from the group consisting of 2 and 3; v and w are integers
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