Bug bites suggest new stroke drug

A treatment for strokes that result from blood clots may be on the horizon, thanks to the parasitic lifestyle of blood-sucking arthropods.

To keep the blood flowing, creatures such as ticks and mosquitoes inject a victim with enzymes called apyrases. Their job is to degrade adenosine diphosphate (ADP), which an animal’s body uses at a wound site to recruit platelets that form a clot.