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Polymorphic assemblies of Bs-FtsZ, in addition to bundles and ribbons (see Fig. 1B). A, filaments observed in Hepes50, pH 6.8, with GTP and PC. B, toroids in another field of the same sample. C, helical bundles in Hepes50 at pH 7.5 with GTP, 10 mm MgCl2, and PC. D, coiled filaments and toroids formed without PC or dimethyl sulfoxide in Mes50 with MgCl2 and GMPCPP. Similar polymers were observed in Hepes50, pH 6.8, or with GTP. Bar, 200 nm.
