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| Nanogram (ng) |
| | A unit of weight consisting of one billionth of a gram (1 x 10-9 g). |
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| Necrosis |
| | Death, usually referring to cell death. |
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| NEL |
| | No Effect Level. A quantity of a substance that is below the threshold on the dose-response curve. |
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| Neonates |
| | Newborn animals. |
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| Neoplasm |
| | An uncontrolled and progressive growth of cells. It may be benign or malignant. same as Tumor. |
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| Neoplastic |
| | Pertaining to or like a neoplasm or neoplasia (tumor). |
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| Nephrotoxin |
| | A systemic poison whose target is the kidney. |
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| Neurotoxicity |
| | Toxicity to cells of the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves outside the CNS). |
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| Neurotoxin |
| | A systemic poison whose target organ is the nervous system. |
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| New Drug Application (NDA) |
| | The process by which a manufacturer of a new drug applies to the Food and Drug Administration for formal approval to market the drug. |
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| NIOSH |
| | National Institute of Occupational Safety and Health. It is an institute in the Public Health Service that conducts research on health hazards in the workplace. |
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| NOAEL |
| | No Observed Adverse Effect Level. The highest dose in a toxicity study at which there were no toxic or adverse effects observed. |
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| Non-Clinical Laboratory Study |
| | A study of a pharmaceutical performed with laboratory animals which provides the basis for human clinical investigations. |
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