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[[Image:Macleod.png|left|John Macleod - co-discover of insulin]] 

John James Richard Macleod (1876 – 1935) was a Scottish physician and physiologist, and was the head of the lab in which [[Banting|Banting]] and [[Best|Best]] discovered [[Insulin|insulin]] in 1921–22. In 1923 Macleod, along with Banting, received the [[Nobel Prize|Nobel Prize]] for Physiology or Medicine for their discovery.<br>&nbsp;