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The horizontal fraction bar was introduced by the Arabs.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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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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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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People about to have surgery must tell their health care providers about all supplements they take.