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Did you know?
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Blood is approximately twice as thick as water because of the cells and other components found in it.