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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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Video: Cytotoxic T cell receptors, activation, proliferation, differentiation & action

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