FIG. 6.

Schematic representation, at scale, of the cell envelopes of E. coli, M. smegmatis, C. glutamicum, and S. gordonii as seen with CEMOVIS. The abbreviations are the same as those in Fig. 3. The GL is drawn as bound to the PM. This hypothesis is based on the conclusion of our previous work with gram-positive bacteria (58). The IWZ is attributed, by analogy to other bacteria, to a periplasmic space. The MWZ represents the peptidoglycan layer in E. coli and S. gordonii and would correspond to the peptidoglycan-arabinogalactan layer in M. smegmatis and C. glutamicum. The OL of M. smegmatis and C. glutamicum is not depicted (see Discussion).