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Alteration of actin cytoskeleton in HeLa cells 36 h after interaction with E22 (wild type) (A), E22ΔTir (B), and a K-12 laboratory strain (C). Both strains E22 (A) and E22ΔTir (B) induced a cell size increase with a multiplication of actin stress fibers characteristic of the CPE. Actin was labeled with rhodamine-phalloidine, and samples were observed with a Leica X300 microscope.
