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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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