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 ?
Substantial heterogeneity was identified in p-AMPK stain, for instance, some neoplasms exhibited positive stain in selected glands or cells and others showed identical stain in all glandular or cellular parts.
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.
Caption: Figure 5: Bladder tumor with CK20 positive stain.
A diagnostic feature of rhabdomyosarcoma is a positive stain for skeletal muscle differentiation.
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.
The control group did not show any positive stain for all MSC markers, while MSCs showed a positive stain for all three markers at different time points.
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.
Cells showing a strong positive stain to PAS and negative stain to AB were observed.
The close association between GCT and extraocular muscle might result from the multiply innervation of the muscle fibers.[sup][1] Almost all cases showed positive staining for both S-100 and CD68.[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.
Second, there was no clear definition of what was considered a positive stain in the earlier studies (Table 1).
(18) Two separate studies performed on fluids in patients with ovarian serous carcinoma demonstrated that 94% (32 of 34) (19) and 69.6% (16 of 23) had positive stains for PAX8, (20) respectively.

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