Life saving vampire bat saliva

I told you vampire bats are our friends. From The L.A. Times:

Every minute counts when someone suffers a stroke. Yet because symptoms are often subtle, most victims arrive at the hospital too late to use medication to dissolve the blood clots that cause most of the brain attacks. As a consequence, thousands of victims suffer severe brain damage or even die. Bat saliva could hold the key to saving them. An experimental drug based on a vampire bat protein has shown promise in clearing away clots up to several hours after a stroke. Such a drug could not only save more lives, it could also reduce the incidence of permanent disability.