null cell


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null cell

[′nəl ‚sel]
(immunology)
A lymphocyte without T- or B-cell markers on its surface.
References in periodicals archive ?
Assuming that categories defined by SF-1 staining (Pit-1/ ACTH-negative, ie, gonadotroph adenomas), ACTH-staining (Pit-1/SF-1-negative, ie, corticotroph adenomas), and Pit-1/SF-1/ACTH-negative tumors (IHC null cell adenoma, see discussion) can be studied with only the screening antibodies and review of clinical and serologic history, approximately one-third fewer stains might be used in the characterization of pituitary adenoma in our system, given the prevalence of adenoma subtypes noted in the current series (Tables 4 and 5, compare Total Stains, Prior System, and Total Stains, New Algorithm).
Falini et al in his study showed that ALCL ALK positive cases were mostly present in present study 92% cases were CD 3 positive and rest of cases were CD 45RO positive with no case of null cell phenotype.