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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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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.