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Fabrication and characterization of Hep-HA hydrogels. (A) Mechanism of methylation of HA (MA-HA), thiolation of heparin (Hep- SH), and the photo-cross-linking of MA-HA and Hep-SH. (B) Storage modulus of hydrogels under different lighting times, before and after swelling for 2 days, measured by a rheometer with a frequency sweep from 0.1 to 10 rad/s. (C) Storage modulus and swelling ratio of two types of hydrogels (2 and 4 wt %; n = 3).
