Extended Data Fig. 1: Loss of CCM3 activates CAFs.

a, HN-CAFs and Cer-CAFs were stained for phospho-S19 myosin light chain 2 (pS19-MLC2 in green), F-actin (red), and DAPI (blue). Scale bars, 50 μm. b, Immunoblotting analyses of the contractile machinery in HN-CAFs and Cer-CAFs, 72 h after siRNA transfection. c, Knockdown efficiency of CCM3 and induction of α-SMA and pS19-MLC2 among all CCM3 siRNAs demonstrates reproducibility. d, Representative traction-force heat maps for transfected V-CAFs. Uncropped blots are provided in the source data.