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ΔCTL bundle formation is enhanced at higher KCl concentrations. Electron micrographs of polymers formed by FtsZ (A and B) or ΔCTL (C and D) on grids 15 min after addition of 2 mm GTP and stained with uranyl formate at 2.5 mm MgCl2 or 10 mm MgCl2, and 50 mm KCl or 300 mm KCl concentrations as indicated. A and C, scale bars, 100 nm. B and D, scale bars, 200 nm. *, single protofilaments; arrow, two- or three-filament bundles; #, multifilament bundles.
