They found that LasB activated signalling pathways which drove the epithelial cells to make a protein called amphiregulin.

他们发现LasB激活了信号通路，驱动上皮细胞产生一种名为双调节蛋白的蛋白质。

As a control, they did the same with some mice genetically engineered to lack the ability to produce amphiregulin when exposed to LasB.

作为对照，他们对一些基因改造的小白鼠做了同样的实验，当暴露在LasB中时，小白鼠缺乏产生双性调节蛋白的能力。