In 1998, the U.S. Food and Drug Administration approved the nation’s first commercial surgical glue to control bleeding during certain surgeries. Called Tisseel, it forms a flexible mesh over an...

In 1998, the U.S. Food and Drug Administration approved the nation’s first commercial surgical glue to control bleeding during certain surgeries. Called Tisseel, it forms a flexible mesh over an oozing blood vessel to help stem bleeding within five minutes. This sealant is made from two blood proteins that naturally cause blood to clot when they react together. Name these proteins.