Movie S1.

ULF exchanges vimentin subunit. A 10-µm-diameter area of a mEos-vimentinY117L–expressing cell was photoconverted from green to red with 405-nm light (see blue circle). The movie shows accumulation of red fluorescence in ULFs outside of the photoconverted area every minute after photoconversion for 5 min. (Scale bar, 10 μm.)