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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.