FIG. 3.

TEMs showing vegetative cross-walls in wild-type and division mutant filaments. Strains were grown for 6 days on R2YE, the medium showing the largest defect in division, and then prepared for TEM examination. (A) A wild-type vegetative cross-wall (strain M145), which can vary in thickness, is shown. (B and C) Normal vegetative cross-walls (50%) are shown for ΔftsI_Sc (JBY5) and ΔftsW_Sc (PFB26) mutants, respectively. (D to G) The other half of the cross-walls are formed aberrantly, as shown for the ftsI_Sc-null mutant (D and F) and the for ftsW_Sc-null mutant (E and G).