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. Author manuscript; available in PMC: 2018 May 5.
Published in final edited form as: J Mol Biol. 2017 Mar 1;429(9):1305–1320. doi: 10.1016/j.jmb.2017.02.014

Fig. 1.

Fig. 1

Morphology of the flagellar basal body of Salmonella. (a) EM reconstruction of the flagellar basal body from Thomas et al. [28]. The structure consists of a central rod and a set of rings. The membrane/supra-membrane (MS) ring is in and just above the cytoplasmic membrane (CM). The outer membrane (LPS) and peptidoglycan (PG) are also indicated. One stator complex is shown; motors can contain up to about a dozen independently functioning stator complexes, each attached to peptidoglycan. Approximate positions of the three switch complex proteins are indicated. (b) A tilted view of the switch complex from a higher-resolution EM reconstruction [6]. Density has been rotationally averaged to improve signal to noise. Most of the switch complex has ~34-fold symmetry, but the inner ring in the upper (membrane-proximal) part displays ~25-fold symmetry.