| http://www.w3.org/ns/prov#value | - In formula II, R1 is a group deriving from a heterobifunctional reagent employed in the elaboration of the linkage conjugating the preferred homing agent EGF and the polymeric moiety III. The conjugation is effected by the coupling of an N-substituted EGF derivative IV: ##STR7## and a derivative (V) of the polymeric moiety III:
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