Fibronectin-coated (5 μg/ml, BD Biosciences, Franklin, Lakes, NJ, USA) polyacrylamide gels were prepared on glass slides (Fisher, Waltham, MA, USA) as previously described22 (link). Two ratios of acrylamide to bis-acrylamide (Fisher), 50:1 and 12.5:1, were used to make gels with Young’s moduli of 1 kPa and 308 kPa, respectively. The Young’s moduli of the polyacrylamide gels were measured using a rheometer as previously described22 (link).
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