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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The longest a person has survived after a heart transplant is 24 years.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.