| NPV | negative predictive value; pressure value; negative pressure ventilation; net present value; nuclear... |
|---|---|
| NRA | nitrate reductase; nucleus retroambigualis |
| NRGC | nucleus reticularis gigantocellularis |
| NRL | nucleus reticularis lateralis |
| NRM | National Registry of Microbiologists; normal range of motion; nucleus reticularis magnocellularis |
| natural killer cells | Large granular lymphocytes which do not express markers of either T or B-cell lineage. These cells do possess Fc receptors for IgG and can kill target cells using antibody-dependent cell-mediated cytotoxicity. NK cells can also use perforin to kill cells in the absence of antibody. Killing may occur without previous sensitization. Synonym: NK cells. (05 Mar 2000) |
|---|---|
| stellate cells of cerebral cortex | Small star-shaped cell's in the second and fourth layers of the cortex, and large stellate cell's in the deeper part of the third layer in the visual cortex. (05 Mar 2000) |
| stellate cells of liver | Large star-shaped or pyramidal cells with a large oval nucleus and a small prominent nucleolus. These intensely phagocytic cells line the walls of the sinusoids of the liver and form a part of the reticuloendothelial system. (12 Dec 1998) |
| stem cells | Relatively undifferentiated cells of the same lineage (family type) that retain the ability to divide and cycle throughout postnatal life to provide cells that can become specialised and take the place of those that die or are lost. (12 Dec 1998) |
| neoplasm circulating cells | Exfoliate neoplastic cells circulating in the blood and associated with metastasizing tumours. (12 Dec 1998) |
| Sternberg cells | Large cells of unknown origin, usually multinucleate, whose presence is the common histologic characteristic of hodgkin disease. (12 Dec 1998) |
| Sternberg-Reed cells | Large cells of unknown origin, usually multinucleate, whose presence is the common histologic characteristic of hodgkin disease. (12 Dec 1998) |
| Neumann's cells | Nucleated cell's in the bone marrow developing into red blood cell's. (05 Mar 2000) |
| neurilemma cells | Neuroglial cells of the peripheral nervous system which form the insulating myelin sheaths of peripheral axons. (12 Dec 1998) |
| neuroepithelial cells | neuroectoderm |
| neuroglia cells | See: neuroglia. (05 Mar 2000) |
| neurolemma cells | Neuroglial cells of the peripheral nervous system which form the insulating myelin sheaths of peripheral axons. (12 Dec 1998) |
| neurosecretory cells | Nerve cell's, such as those of the hypothalamus, that elaborate a chemical substance (such as a releasing factor, neuropeptide, or, more rarely, a true hormone) that influences the activity of another structure (e.g., anterior lobe of the hypophysis). See also neurosecretion. (05 Mar 2000) |
| stromal cells | Connective tissue cells of an organ found in the loose connective tissue. These are most often associated with the uterine mucosa and the ovary as well as the haematopoietic system and elsewhere. (12 Dec 1998) |
| NK cells | Large granular lymphocytes which do not express markers of either T or B-cell lineage. These cells do possess Fc receptors for IgG and can kill target cells using antibody-dependent cell-mediated cytotoxicity. NK cells can also use perforin to kill cells in the absence of antibody. Killing may occur without previous sensitization. Synonym: NK cells. (05 Mar 2000) |