Figure 4

Invasion of HeLa cells by recombinant E. coli expressing Mce1C. (a) HeLa cells were infected with induced E. coli expressing Mce1C for 4 h and then analyzed by electron microscopy. (b) Negative control (E. coli-pet30a). Recombinant E. coli. were marked by arrows. Bars = 0.5 μm.