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Formation of 2D crystals and projection map. (A) Micrograph of a uranyl acetate-stained 2D crystal. (B) The projection map, calculated from seven merged images, at 7.0-Å resolution, showing an orthogonal arrangement of dodecameric rings. One unit cell is outlined and has the dimensions of a = 83.5 ± 0.6 Å, b = 83.5 ± 0.6 Å, and γ = 90.4 ± 0.4°.
