null cell

Etymology: L, nullus, not one, cella, storeroom

a lymphocyte that develops in the bone marrow and lacks the characteristic surface markers of the B and T cells (surface immunoglobulin or the pan-T antigen). Null cells represent a small proportion of the lymphocyte population. Stimulated by the presence of antibody, null cells can attack certain cellular targets directly. They kill tumor or viral-infected cells, although not with the specificity of cytotoxic T cells. Kinds of null cells are killer cells and natural killer cells . Compare B cell, T cell. See also cytotoxin, immune gamma globulin.

null cell,

n a lymphocyte that develops in the bone marrow and lacks the characteristic surface markers of the B and T lymphocytes. Null cells stimulated by the presence of antibody can directly attack certain cellular targets and are known as “natural killers” or “killer cells.”

null

an absence of information, as contrasted with zero or blank or nil, about a value.

null cell

called also null lymphocyte; see null cell.

null hypothesis

a statistical hypothesis which states that one variable has no association with another variable, or set of variables. That is, the observed results can be explained by chance alone.

null lymphocyte

see null cell.

Mentioned in	?		References in periodicals archive	?		Medical browser	?		Full browser	?
acidophilic adenoma acute lymphocytic leukemia adenoma adenoma sebaceum adventitial cell air cell basophilic adenoma carcinoma ex pleomorphic adenoma chromophobe adenoma chromophobic adenoma corticotroph adenoma corticotropinoma eosinophilic adenoma Hürthle cell adenoma K cell killer cell LAK cells natural killer cell null	The histologic classification was performed according to schemes for lymphomas (12): 2 anaplastic large null cell lymphoma, 1 anaplastic large T-cell lymphoma, 10 diffuse large B-cell lymphoma (1 with primary immunodeficiency and 1 primary central nervous system lymphoma in a human immunodeficiency virus [HIV]-positive patient), 12 Burkitt lymphoma (2 HIV positive), 1 B lymphoblastic lymphoma, and 6 T lymphoblastic lymphoma (1 with primary immunodeficiency). Assessment of Epstein-Barr virus association with pediatric ... by Chabay, Paola A.; De Matteo, Elena N.; Aversa, Luis; Maglio, Silvana; Grinstein, Saul; Preciado, Mar / Archives of Pathology & Laboratory Medicine [Beta]-pol null cells were used to show that removal of 5'-deoxyribose phosphate moiety from DNA is a key step in base excision repair (17). The "New" Genetics and Mammalian Cloning in Environmental Health ... by Iannaccone, Philip M. / Environmental Health Perspectives	Nucleoside analogues nucleoside monophosphate kinase nucleoside reverse transcriptase inhibitors nucleosome nucleotidase nucleotide nucleotidyl nucleotidyltransferase nucleotoxin nucleus nucleus fastigii nucleus gracilis nucleus of solitary tract nucleus pulposus nuclide Nuctane NUD nude mouse nudge control Nudism NUG Nugent forceps Nuhn's gland Nuke null null cell null hypothesis nulli- nulligravida nullipara nulliparity nulliparous num numb number number crunching number needed to treat number, Brinell hardness number, Vickers hardness numbness Numbness and Tingling numeracy numerator numeric numeric pain scale numeric taxonomy numerical Numidicola antennatus Numidinae Numinbah horse sickness nummular	NULGE Nulia bona NULIS NULITES Nulius filius NULJ null null null null null null null Null (Character) Null (Character) Null allele Null allele Null allele Null alleles Null and Void Null and Void Null and Void Null and Void Null and Void Null and Void Null Attachment Concentrator null c's null c's null c's null c's null cell null cells null cells null cells null cells null character null character null characters null characters Null Command Generator Null cone Null Convention Logic Null copula null detection null detector Null geodesic null hypotheses null hypotheses null hypotheses Null hypothesis Null hypothesis Null hypothesis Null hypothesis Null hypothesis Null Hypothesis Significance Testing Null Hypothesis Significance Testing Procedure null indicator null instrument null lymphocyte null lymphocyte null lymphocyte

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acidophilic adenoma
acute lymphocytic leukemia
adenoma
adenoma sebaceum
adventitial cell
air cell
basophilic adenoma
carcinoma ex pleomorphic adenoma
chromophobe adenoma
chromophobic adenoma
corticotroph adenoma
corticotropinoma
eosinophilic adenoma
Hürthle cell adenoma
K cell
killer cell
LAK cells
natural killer cell
null

The histologic classification was performed according to schemes for lymphomas (12): 2 anaplastic large null cell lymphoma, 1 anaplastic large T-cell lymphoma, 10 diffuse large B-cell lymphoma (1 with primary immunodeficiency and 1 primary central nervous system lymphoma in a human immunodeficiency virus [HIV]-positive patient), 12 Burkitt lymphoma (2 HIV positive), 1 B lymphoblastic lymphoma, and 6 T lymphoblastic lymphoma (1 with primary immunodeficiency).

Assessment of Epstein-Barr virus association with pediatric ... by Chabay, Paola A.; De Matteo, Elena N.; Aversa, Luis; Maglio, Silvana; Grinstein, Saul; Preciado, Mar / Archives of Pathology & Laboratory Medicine

[Beta]-pol null cells were used to show that removal of 5'-deoxyribose phosphate moiety from DNA is a key step in base excision repair (17).

The "New" Genetics and Mammalian Cloning in Environmental Health ... by Iannaccone, Philip M. / Environmental Health Perspectives