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Mechanical stiffness testing of fibrin scaffolds. (A) Strip of scaffold mounted between a force transducer and a motor (10× magnification). (B) Step length changes (4%–24%) with resulting tension measured as force (mN). (C) Normalized steady-state force (mN/mm2) is plotted against % length change, and the slope of the resulting regression line is the material stiffness (kPa).
