Structural details of haditoxin. A, superimposition of both subunits of haditoxin. Subunits A and B are shown in blue and red, respectively. B, superimposition subunit A of haditoxin with short-chain α-neurotoxins. Subunit A is shown in blue, erabutoxin-a is shown in magenta, erabutoxin-b is shown in cyan, and toxin-α is shown in green. C, stereo diagram of comparison of dimer interface of haditoxin (top) and κ-bungarotoxin (bottom). The residues to form the hydrogen bonds are labeled. The main chain-main chain hydrogen bonds are shown in red, and the other hydrogen bonds are shown in yellow.