Figure 1From: Pharmacokinetic properties and antitumor efficacy of the 5-fluorouracil loaded PEG-hydrogel The chemical structures of the 6-arm PEG- AM and 6-arm PEG- SG. PEG-hydrogel network made by 6-arm PEG-AM and 6-arm PEG-SG. After displacement of the NHS (N-hydroxy succinimide) from 6-arm PEG-SG, amine residues on 6-arm PEG-AM are cross-linked with 6-arm PEG-SG.Back to article page