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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 average adult has about 21 square feet of skin.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.