| http://www.w3.org/ns/prov#value | - Compositions of the invention containing biologically active cytokines or growth factors such as TGF-?? are prepared by admixing an appropriate amount of the cytokine or growth factor into the composition, or by incorporating the cytokine or growth factor into the glycosaminoglycan prior to treatment with activated PEG. Preferably, the cytokine or growth factor is first reacted with a molar excess
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