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Polymers of Anabaena FtsZ and ΔN-FtsZ proteins. Proteins (3 μM) were incubated during 20 min in the presence of 2 mM GTP under polymerization conditions and visualized after negative staining with uranyl acetate. Magnification was: 3,150× (upper left), 2,000× (lower left), 8,000× (right).
