The differential location of MIIA and MIIB assembly determines their subcellular localization. (MIIA) Time-lapse sequence of a migrating CHO.K1 cell transfected with GFP-MIIA. Bar, 5 μm. Arrowheads point to representative MIIA filaments as they form. These panels correspond to Video 3 . (MIIB) Time-lapse sequence of a migrating CHO.K1 cell transfected with GFP-MIIB. Time is in minutes. Bar, 5 μm. These panels correspond to Video 4 .