danger signal

The biological functions of these EV-packaged molecules are still being explored, but in this case, the researchers discovered that in various cancer types, EV-DNA secreted by tumor cells works as a "danger" signal that activates an anti-tumor response in the liver, reducing the risk of liver metastasis.

A pair of electronic loops in the track, looking like a grid or electric toaster, automatically cause a train to brake if it approaches a danger signal too fast.

Hopefully, future generations will look back on the Dengue outbreak in Puerto Rico as the catalyst for an enduringly significant societal accomplishment, not a danger signal we missed or dismissed.

"Not just through habitat loss and climate change and species extinction, which is all important stuff. But just having us out there on that landscape is enough of a danger signal that they respond really strongly. They are scared to death of humans, way more than any other predator."

The UAW failing to endorse Biden is "a bit of a danger signal," given Michigan's importance in 2024, said Harley Shaiken, labor professor at the University of California, Berkeley.