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Two-dimensional class averaging of gB and Fab-bound gB. (A) Projection of a rotationally symmetrized gB model (PDB code 3NWF). (B) Projection of the gB model without imposed symmetry. (C) gB only. (D to I) Fab-bound gB. The figure shows three representatives (left panels) and the 2D class averages (rightmost panels) of each sample imaged. Bar, 20 nm.
