Streptokinase
Streptokinase was discovered in 1933 by American microbiologist, William S. Tillett, from a bacteria known as beta-hemolytic streptococci. It is on the World Health Organization's List of Essential Medicines. Streptokinase is no longer used in hospitals to treat heart attacks in many countries including United States and replaced by a medication called Tenecteplase which has less side effects.