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F-actin bundling. Actin (3 μM) was polymerized in the presence of (A) talin, (B) GST, (C) GST-Tn, or (D) GST-Sla2 (3 μM each), and the resulting F-actin preparations were negatively stained with uranyl formate and visualized by electron microscopy. (Bar = 10 μM).
