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Freeze-etched (a–c, e, f) and freeze-dried (d) metal-shadowed preparations of T. forsythia wt cells. a Cylindrical portion of the cell showing an undisturbed square S-layer lattice; inset, power spectrum of this lattice. b, c Cell the poles with grain boundaries in the S-layer lattice (white arrows, compare also with d). e Cell pole of a freeze-dried T. forsythia wt cell. S-layer lattice on (e) T. forsythia ΔtfsA and f T. forsythia ΔtfsB
