The National Institutes of Health (www.nih.gov), a part of the U.S. Department of Health and Human Services, is the primary Federal agency for conducting and supporting medical research. NIH maintains 27 Institutes and Centers. The NIH invests over $27 billion annually in medical research, mostly through almost 50,000 competitive grants transferred to more than 212,000 researchers at over 2,800 universities, medical schools, and other research institutions in every state and around the world. About 10% of the NIH’s budget supports projects conducted by nearly 6,000 scientists in its own laboratories, most of which are on the NIH campus in Bethesda, Maryland.