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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.