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Hydrogel formation for type I collagen crosslinked with 4S-StarPEG: (A) crosslinked type I collagen-formed hydrogels; (B) FTIR spectra of type I collagen hydrogels: A, non-crosslinked hydrogel; B, hydrogel crosslinked with 0.01 mM 4S-StarPEG; C, hydrogel crosslinked with 0.05 mM 4S-StarPEG; D, hydrogel crosslinked with 0.1 mM 4S-StarPEG.
