Fig 4.

Cross-wall formation in Streptomyces coelicolor. (A) Cross walls (arrows) are formed at irregular intervals in vegetative hyphae of Streptomyces, and their structure and control of their localization are still poorly understood. Left, fluorescence micrograph after staining with the membrane dye FM5-95; right, corresponding light image. Bar, 5 μm. (B) Electron micrograph of a cross wall at higher resolution. (C) Transmission electron micrograph of a complete cross-wall with likely channels (arrowheads; apparent as lighter sections) and a bulge. Bar, 100 nm. It should be noted that cross walls may not all have channels. Figure 4C adapted from reference 76 with permission.