For these experiments, mouse fibroblasts were analyzed after being cultured on flat or microgrooved surfaces for 3 days. a, Nuclear HDAC activity assay (n=3). * p<0.05 (two-tailed, unpaired t-test) compared with the control flat surface. b, Western blotting (WB) analysis of HDACs. c, Confocal microscopy of HDAC2 staining. d, WB analysis of WDR5. e, Confocal microscopy of WDR5. f, WB analysis performed on fibroblasts cultured on microgrooves after siRNA knockdown of WDR5. (Scale bars in c and e, 10 μm)