Botulinum toxins are produced in culture as molecular complexes consisting of non-toxic components and toxic Bonts, which form a new group of metalloproteinase composed of three nonhomologous domans.

• 肉毒毒素在培养液中以复合物形式存在,其中的毒性组分由3个非同源性结构域组成,是一种新型的金属蛋白酶。