11.   The cause of death was believed to be a blood clot, said Evelyn Shriver, a spokeswoman for the singer.

12.   They tend to have high blood pressure, and their blood may clot more easily.

13.   Her blood did not clot properly.

14.   Tests in monkeys suggest that the immune system tried to destroy the foreign protein so much that it ended up eliminating proteins that cause blood to clot.

15.   The disease causes a dramatic drop in platelets, which allow the blood to clot.

16.   The disease causes a sharp drop in platelets, which allow the blood to clot.

17.   Without it, her blood did not clot properly.