Interaction of Botulinum Toxin with the Epithelial Barrier

Figure 2

Features of types A to G BoNT complexes. Type A (A1) BoNT is produced by C. botulinum in three forms: 12S, 16S, and 19S toxins. Types B, C, and D BoNT are produced in two forms: 16S and 12S toxins. Types E, F, (and A2) BoNT are produced as 12S toxin. Type G BoNT complex is produced as 16S toxin (reviewed in [3, 6, 7]).