Fig. 1

Scanning electron micrographs of pellicles from K.xylinus wild-type (WT), plr15, bcsaA449T, or bcsaA449V cultures grown for seven days under static conditions in the absence (a, c, e, and g) or presence of 10 μM pellicin (b, d, f, and h). In contrast to wild type cells which produce no pellicle in the presence of pellicin and are embedded in a gel-like substance (b), pellicles produced by mutant cells are surrounded by long cellulose fibrils (c, d, e, f, g, and h). Bars correspond to 2.5 μm