| Abbreviation | Definition |
|---|---|
| NML | National Microbiology Laboratory |
| NMPB | National Medicinal Plants Board |
| NPCD | Neuronal Pentraxin Chromo Domain |
| NPGAA | Nested-Primer Gene Amplification Assay |
| NRBE | Nuclear Radiation and its Biological Effects |
| NRBI | Non Reciprocal Bi Isotropic |
| NRBP | Newt RNA Binding Protein |
| NRBP | Nuclear Receptor Binding Protein |
| NRLT | Non Reciprocal Lipid Transfer |
| NRRL | American Research Service (ARC) culture collection or (NRRL). The Northern Regional Research Laboratory (now the National Center For Agricultural Utilization Research) opened in 1940. |
| NSEB | National Standard Examination in Biology |
| NSMB | Nature Structural & Molecular Biology |
| NTHE | Near Term Human Extinction |
| NTM | non-tuberculous mycobacterium/a |
| NVBF | Northern Vascular Biology Forum |
| O | Organism |
| O1C | A protein molecule. Formula: 2ALPHA-(3-HYDROXYPROPYL)-1ALPHA,25-DIHYDROXYVITAMIN D3 |
| OAVC | Ovarian ArterioVenous Complex |
| OBBS | Office of Basic Biological Sciences |
| OBCS | Ontology of Biological and Clinical Statistics |