Before the discovery of insulin, diabetes was a feared disease that most certainly led to death.

Although insulin doesn't cure diabetes, it's one of the biggest discoveries in medicine. 

Following the birth of an idea, nine months of experimentation, and through the combined efforts of four men at the University of Toronto, insulin was discovered and later purified for human use. The first successful test on a human patient with diabetes occured on January 23, 1922. The death sentence for diabetes sufferers around the world had finally been lifted.
Dr. F.G. Banting, c. 1921

Dr. F.G. Banting, c. 1921
Conceived the idea of extracting insulin from the pancreas -London, Ontario, October 31, 1920

Prof. J.J.R. Macleod, c. 1921 Prof. J.J.R. Macleod, c. 1921
Offered Banting space in his Toronto laboratory and provided advice on methods for extracting insulin 
C.H. Best, c. 1921 C.H. Best, c. 1921
Assisted Banting during the summer of 1921 in preparing pancreatic extracts that prolonged the lives of diabetic dogs. 
Dr. J.B. Collip, c. 1921 Dr. J.B. Collip, c. 1921
Purified the crude insulin extract for use in humans - first successfully tested in January 1922

"...had I not failed in my one year at London, I might never have started my research work...[London] the place of my hours of misery - and yet it was there that I obtained the idea that was to alter every plan that I had ever made. The idea which was to change my future and possibly the future of others."
-Banting, 1940

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