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Various crystals of B. subtilis FlhF. (a) Bipyramidal crystals grown in the presence of 5 mM GDP (crystal form A, Table 1 ▶). (b) Crystals grown in the presence of 5 mM GMPPNP show a similar bipyramidal shape (crystal form B, Table 1 ▶). (c) Bipyramidal crystals (labelled ‘2’) grown in the presence of 5 mM GMPPNP transform after 3–5 weeks into cuboids (labelled ‘1’; crystal form C, Table 1 ▶). The size of the crystals is typically about 30–70 µm.
