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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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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are 20 feet of blood vessels in each square inch of human skin.