FIG 1.

Images of infected and uninfected macrophages. (E to H) Infection of macrophages by Y. enterocolitica. P388D1 cells were infected with a constitutive GFP-expressing strain of Y. enterocolitica and, after 1 h of infection, treated with gentamicin. The infection was allowed to proceed for an additional 3 h, at which point macrophages were stained with the DNA-specific dye Hoechst 33342. (A to D) An uninfected control was treated in the same manner. Live cells are pictured at ×600 magnification.