FIG. 4.

Cell length and width measurements of mature attack-phase cells and immature Bdellovibrio progeny from bdelloplasts. The average length of the cells before infection (white) was 1.66 ± 0.24 μm (n = 100), while that of progeny cells in bdelloplasts at 3 h after infection (black) was 0.87 ± 0.12 μm (n = 89). The average cell width is similar between recently divided progeny cells (0.350 ± 0.05 μm) and mature attack-phase cells (0.316 ± 0.04 μm). We also show two representative cells of the two types, side by side, under the same negative staining conditions and using a just-released cell as the immature progeny example to avoid bdelloplast debris. Bar = 1 μm.