The article focuses on how Francisella tularensis can retrieve targeting nutrient. It says that F. tularensis has quickly escapes from the acidified late endosome-like phagosome into the cytosol after it enters into the cells of mammals and arthropoda. It mentions that F. tularensis has exploited the host glutathione (GSH) and utilizes the enzyme glutamyl transpeptidase (Ggt).