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Electron microscopic analysis of FtsZ polymers. Polymerization was initiated at different MgCl2 concentrations. (a) No MgCl2; (b) ordered aggregates of parallel protofilaments formed at 5 mM MgCl2; (c) 10 mM MgCl2 (insets, blowups showing bending [top] and fraying [bottom]); (d) 10 mM SRI 7614 and 5 mM MgCl2. Magnifications, ×40,000 (a to c) and ×50,000 (d).
