Abel, John Jacob (1857–1938)
American biochemist, best known for his first identification (1898) of a hormone, adrenaline (epinephrine). Abel was professor of pharmacology (1893–1932) at Johns Hopkins University. He made his key discovery after many years of studying the chemical composition of body tissues, finally isolated the hormone from the suprarenal glands of sheep. Later, Abel isolated amino acids from blood by the process of dialysis, and discovered insulin in crystalline form.
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