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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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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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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.