Single-molecule speckle (SiMS) observation of EGFP-mDia1Full, EGFP-mDia1ΔC63 and EGFP-mDia1ΔN3 in live XTC cells. For SiMS imaging, the expression level of EGFP-mDia1 mutants was reduced by the defective CMV promoter. Time is in seconds. Scale bar, 10 μm.