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Compressive stress vs. compressive strain curves for (A) dex-PDA hydrogels with feed ratios ranging 2:1–2:0.2 (dextran hydrogel has no PDA present). (B) dex-PEI-PDA hydrogels with feed ratios ranging 2:1:1–2:1:0.2 (dex-PEI hydrogel has no PDA present).
