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Biaxial mechanical tests on acellular cruciform-shaped collagen gels revealed non-linear viscoelastic response curves with larger loads for higher mTG doses and incubation times. First Piola–Kirchhoff stress (kPa)–engineering strain curves of control and mTG-treated collagen gels tested on (A) day 1, (B) day 2 and (C) day 7. Note changes in scale of first Piola–Kirchhoff stress (kPa) axes.
