FIG. 2.

Bdellovibrio cells produce both odd and even numbers of progeny within the bdelloplast, as visualized by electron microscopy. (a) Distribution of number of progeny within E. coli DFB225 bdelloplasts at 3 h postinfection (n = 77). (b) Examples of septated Bdellovibrio progeny within bdelloplasts at 3 h postinfection, showing (from left to right) 3, 4, and 5 progeny cells. Cells were stained with 2% PTA (pH 7.0). Bars = 500 nm. The average E. coli DFB225 prey cell length in this experiment was 2 μm.