Fig. 2.

Extracellular matrix (ECM) hydrogel substrates for cell growth. a Effect of bis-acrylamide ratio on ECM stiffness measured with a power reactor. b Cells cultured with gel solution extract and cell viability assessed 24 h, 48 h, or 72 h later. c Scanning electron microscopy images of gels without or with 0.2 mg/cm² fibronectin (FN) coating (scale bar = 10 μm) and FN-coated substrate with cells (scale bar = 20 μm). n = 3. ECM extracellular matrix, TCP tissue culture dishes