Myoblast differentiation was examined according to previously published protocols [18 (link)], and samples were imaged on INCell Analyzer 6000 (GE Healthcare), equipped with 10×/0.45 NA Plan Apo objective and 2048 × 2048 sCMOS camera. Twenty-five fields with five z-planes were acquired. Individual focal plane image for each z-series was automatically selected based on sharpness. Image analysis algorithm and PCR is described in Supplementary Methods.