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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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.