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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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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The longest a person has survived after a heart transplant is 24 years.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.