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official website of the national institutes of health (nih). nih is one of the world's foremost medical research centers. an agency of the u.s. department of health and human services, the nih is the federal focal point for health research. the nih website offers health information for the public as well as medical professionals. there's extensive information on funding opportunities and links to the many institutes and centers that make-up nih such as the national cancer institute and the national library of medicine.