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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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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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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The familiar sounds of your heart are made by the heart's valves as they open and close.