ACTA1 and infection: Indeed, the percentage of intracytosolic ΔactA over-expressing InlK having recruited MVP at 4 h post-infection was 88.3±12.7% (mean ± SEM from n = 3 experiments), compared to the 16.8±2.5% (mean ± SEM from n = 3 experiments) observed when using the InlK over-expressing strains that are able to polymerize actin via ActA.