| NI | neuraminidase inhibition; neurological improvement; neutralization index; no information; noise index; not identified; not isolated; nucleus intercalatus |
|---|---|
| Ni | nickel |
| NI-NXII | first to twelfth cranial nerves |
| NIA | National Institute on Aging; nephelometric inhibition assay; niacin; no information available; Nutritional Institute of America |
| nia | niacin |
| NIAAA | National Institute of Alcohol Abuse and Alcoholism |
| NIADDK | National Institute of Arthritis, Diabetes, Digestive and Kidney Diseases |
| NIAID | National Institute of Allergy and Infectious Diseases |
| NIAMDD | National Institute of Arthritis, Metabolism, and Digestive Diseases |
| NIAMS | National Institute of Arthritis, Musculoskeletal and Skin Diseases |