ParB in N99ihfA cells containing the mini-P1 plasmid pLG44. Cy3-stained ParB is shown at Left (A, C, D, and F), and Nomarski images are shown at Right (B, E, and G). (A–E) N99ihfA(pLG44) cells. (F and G) Cephalexin-treated filaments. D is an underexposed version of C. (Bar = 1 μm.)