FIG. 6.

Representative slices from tomograms of sections obtained from wild-type cells processed in the same way that the strain overproducing Tsr was processed. Invaginations in the cytoplasmic membrane are evident in both tomograms. The invagination in panel a appears to be too small to accommodate an axially interacting cluster of chemotaxis receptors, while the invagination in panel b has the potential to accommodate such an interdigitated receptor cluster at the locations indicated by the arrow (width, ∼50 nm). Scale bars = 50 nm.