Kalb SR, Baudys J, Egan C, Smith TJ, Smith LA, Pirkle JL, Barr JR. Different substrate recognition requirements for cleavage of synaptobrevin-2 by Clostridium baratii and Clostridium botulinum type F neurotoxins. Appl Environ Microbiol. 2011 Feb; 77(4):1301-8.