It could be the response is 'there's something dangerous in the environment, we got to move away', and so the response is for the cell to crawl in the opposite direction.

这个信号还有可能是,"外面很危险,我们得赶紧跑",于是细胞就向相反方向游走了

耶鲁公开课 - 生物医学工程探索课程节选

Not that Boeing is publicly jumping on any scapegoats to wholly blame for the worldwide grounding of its 787 Dreamliners after the Federal Aviation Agency ( FAA ) issued an emergency airworthiness direction (AD) in response to a battery fire that forced an All Nippon Airways plane to make an emergency landing in Japan on January 16.

FORBES: The Dreamliner: Boeing's Big Brand Hangs in the Balance

Mr. Najib's election win buoyed financial markets, and the prime minister viewed their response as a stamp of approval for the direction he is trying to take the country.

WSJ: Malaysia's Leader Urges Unity After Tense Vote

We are being pushed in the direction of instant information, action and response.

FORBES: Why I Would Buy Google Glass But Not an iWatch