Pain-sensing neurons, however, possess a subclass of voltage-gated sodium channels, known as the TTX-resistant type, that do not occur in the CNS.

• 不过，痛觉受器却拥有一种特别的电位控制钠离子通道，称为河魨毒（tx）敏感型，而中枢神经系统里并没有这一型。