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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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The longest a person has survived after a heart transplant is 24 years.