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Patent Granted Tir (translocated intimin receptor) is an essential component in the adherence of the enteropathogenic Escherichia coli (EPEC) and enterohemorraghic Escherichia coli to the cells lining the small intestine. To aid attachment, both EPEC and EHEC possess the ability to reorganise the host cell actin cytoskeleton via the secretion of virulence factors. These factors are secreted directly into the cells using a Type three secretion system.