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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: Biomaterials. 2017 Jun 29;141:125–135. doi: 10.1016/j.biomaterials.2017.06.039

Figure 1.

Figure 1

An interpenetrating network of collagen and gelMA was formed to allow for independent tuning of scaffold stiffness and collagen fiber content. (A) Collagen was polymerized in the presence of gelMA, which was then crosslinked via UV exposure in the presence of the photoinitiator LAP. (B) By changing the amount of collagen and the degree of gelMA methacrylation, the fiber content and scaffold stiffness can be tuned. Hydrogel images depict 7 kPa with 0, 1.5, or 3 mg/mL collagen (top to bottom), scale bar = 5 mm.