But first they needed to get their hands on some chlorotoxin.

但是首先他们需要得到一些氯毒素。

Chlorotoxin is harmless to humans, but it binds to a type of cancerous brain cell and leaves regular cells alone.

氯毒素对人类无害，但它会与一种癌性脑细胞结合，而不会影响正常细胞。

And they were in luck, 'cause a few years earlier a neuroscientist had discovered that one scorpion known as the deathstalker had a special ingredient in its venom called chlorotoxin.

他们很幸运，因为几年前，一位神经科学家发现一种被称为死亡跟踪者的蝎子毒液中含有一种叫做氯毒素的特殊成分。