They also want to know why safety officials failed to activate some emergency signals.

他们还想知道安全官员未能启动一些紧急信号的原因。

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。