Reference:
Michell SL, Dean RE, Eyles JE, Hartley MG, Waters E, Prior JL, Titball RW, Oyston PC. Deletion of the Bacillus anthracis capB homologue in Francisella tularensis subspecies tularensis generates an attenuated strain that protects mice against virulent tularaemia. Journal of Medical Microbiology 2010;59(11): 1275-1284.