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Targeting elastic modulus by using N-Acetyl-l-Cysteine to break disulfide bonds in PEGSSDA cross-linked hydrogels, and resulting proliferation rates: (A) U373 cells; (B) A172 cells; (C) U87 cells and (D) U87 EGFRvIII cells. Targeting elastic modulus with collagenase/hyaluronidase to degrade the hyaluronic acid (HA) and gelatin components in S3 hydrogels: (E) U373 cells; (F) A172 cells; (G) U87 cells and (H) U87 EGFR viii cells. * Denotes p value is less than 0.05.
