positive stain

pos·i·tive stain

direct binding of a dye with a tissue component to produce contrast; in electron microscopy, heavy metals like uranyl and lead salts are used to bind to selective cell constituents to produce increased density to the electron beam, that is, contrast.

pos·i·tive stain

(poz'i-tiv stān)
Direct binding of a dye with a tissue component to produce contrast; in electron microscopy, heavy metals like uranyl and lead salts are used to bind to selective cell constituents to produce increased density to the electron beam, i.e., contrast.
References in periodicals archive ?
FeLV antigens were immunohistochemically detected in the hematopoietic cells of the bone marrow (Figure 1D, detail); however, positive stain was not observed in tumoral cells.
A diagnostic feature of rhabdomyosarcoma is a positive stain for skeletal muscle differentiation.
The normal controls stained with IHC for dystrophin and b-spectrin showed positive stain of the sarcolemmal membrane (Fig.
As an evaluation of immune staining, a positive stain was indicated by a brown colored precipitate in the following manner: 1) cells labeled by CAL displayed cytoplasmic and nuclear staining; and 2) cells labeled by CEA displayed a cytoplasmic staining pattern.
The positive stain for S-100 was also observed in 100% of the neurofibroma cases, which is a rate similar to that found in the literature.
Cells showing a strong positive stain to PAS and negative stain to AB were observed.
sup][1],[4],[5] The positive stain with CD68 can be explained by the intracytoplasmic accumulation of phagolysosomes and does not reflect a histiocytic origin.
In general, antibodies to the latency-associated nuclear antigen LANA1 are employed, with nuclear reactivity indicating a positive stain.
Second, there was no clear definition of what was considered a positive stain in the earlier studies (Table 1).
112-114) Positive stains can be cytoplasmic, membranous, canalicular, and/or cytoplasmic dotlike.

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