The article discusses the study being done on the facultative intracellular pathogen Listeria monocytogenes. It references the study "Prophage excision activates Listeria competence genes that promote phagosomal escape and virulence," by L. Rabinovich and colleagues in the 2012 issue of "Cell." It states that phagosomal escape is driven by an intact comK gene generated by prophage excision.