A, B, and C show maps for plasmids bearing both the RsrII multiple cloning site (mcs) and the Francisella blaB promoter. pMP814 (A) and pMP822 (B) are both stable plasmids, but pMP814 is KmR and pMP822 is HygR, while pMP823 (C) is unstable and HygR. D, E, and F show maps for plasmids pMP828, pMP831, and pMP829, that correspond to the plasmids in A, B, and C, except that they lack the blaB promoter.