Following are links to the 27 National Institutes of Health and Centers:

NIH Institutes

National Cancer Institute (NCI)
http://www.cancer.gov/

National Eye Institute (NEI)
http://www.nei.nih.gov/

National Heart, Lung & Blood Institute (NHLBI)
http://www.nhlbi.nih.gov/

National Human Genome Research Institute (NHGRI)
http://www.genome.gov/

National Institute on Aging (NIA)
http://www.nia.nih.gov/

National Institute on Alcohol Abuse & Alcoholism (NIAAA)
http://www.niaaa.nih.gov/

National Institute of Allergy & Infectious Diseases (NIAID)
http://www.niaid.nih.gov/

National Institute of Arthritis & Musculoskeletal & Skin Diseases
http://www.niams.nih.gov/

National Institute of Biomedical Imaging & Bioengineering
http://www.nibib.nih.gov/

National Institute of Child Health & Human Development
http://www.nichd.nih.gov/

National Institute on Deafness & Other Communication Disorders
http://www.nidcd.nih.gov/

National Institute of Dental & Craniofacial Research (NIDCR)
http://www.nidcr.nih.gov/

National Institute of Diabetes & Digestive & Kidney Diseases
http://www2.niddk.nih.gov/

National Institute on Drug Abuse (NIDA)
http://www.nida.nih.gov/

National Institute of Environmental Health Sciences (NIEHS)
http://www.niehs.nih.gov/

National Institute of General Medical Sciences (NIGMS)
http://www.nigms.nih.gov/

National Institute of Mental Health (NIMH)
http://www.nimh.nih.gov/

National Institute of Neurological Disorders & Stroke (NINDS)
http://www.ninds.nih.gov/

National Institute of Nursing Research (NINR)
http://www.ninr.nih.gov/

National Library of Medicine (NLM)
http://www.nlm.nih.gov/

NIH Centers

Center for Information Technology (CIT)
http://www.cit.nih.gov/

Center for Scientific Review (CSR)
http://cms.csr.nih.gov/

Fogarty Int’l Center for Advanced Study in the Health Sciences
http://www.fic.nih.gov/

National Center for Complementary & Alternative Medicine
http://nccam.nih.gov/

National Institute on Minority Health & Health Disparities
http://www.nimhd.nih.gov

National Center for Research Resources (NCRR)
http://www.ncrr.nih.gov/

NIH Clinical Center (CC)
http://clinicalcenter.nih.gov/