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 ?
Forceps biopsy confirmed GCT with a positive stain for S-100 (Fig.
The lesion was completely removed by hot biopsy with histology confirming GCT with a positive stain for S-100.
Because of this limited sensitivity, a negative stain should not be considered informative (negative predictive value = 40%), but because of high specificity, a positive stain does strongly favor malignancy (positive predictive value = 98%).
Immunoreactivity evaluations revealed a diffuse stain for vimentin (figure 2, B) and weakly positive stains for CD34, CD99, Bcl-2, and smooth-muscle actin; stains for epithelial markers, melanoma markers, S-100 protein, and desmin were negative.
These diagnoses were supported by neuroendocrine immunohistochemical stains: positive stains for CD56, synaptophysin, chromogranin, and neurofilament in the poorly differentiated tumor cells in the uterus (Figure 8) and positive stains for chromogranin and CD56 in the pancreas (Figure 9).

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