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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.