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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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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.

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