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Structural analysis of the EA1 S-layer. (a) Negatively stained expelled fragment of an EA1 array; inset, diffraction pattern. (b and c) Freeze-etched unidirectional shadowed specimen showing both the corrugated (b) and smooth (c) sides. (e) Projection map of a negatively stained EA1 array; inset, schematic representation of the protein mass as a flying bird. (d and f) Projection map of the corrugated (d) and smooth (f) sides of the EA1 array. Scale bar, 100 nm.
