Organization and Phylogenetic Interrelationships of Genes Encoding Components of the Botulinum Toxin Complex in Proteolytic Clostridium Botulinum Types A, B, and F: Evidence of Chimeric Sequences in the Gene Encoding the Nontoxic Nonhemagglutinin Component

International Journal of Systematic Bacteriology

doi 10.1099/00207713-46-4-1105