| http://www.w3.org/ns/prov#value | - The invention particularly concerns the embodiments wherein such derivatives contain an average of from 2 to 15 molecules of a monofunctional poly(ethylene) glycol, and wherein the monofunctional poly(ethylene) glycol is an N-hydroxysuccinimidyl active ester of the propionic acid of poly(ethylene) glycol, an N-hydroxysuccinimidyl active ester of the succcinate poly(ethylene) glycol, an N-hydroxysu
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