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a stain of contrasting color that is used when the principal stain does not show the structure clearly

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To determine the Paneth cell-specific expression of DEFA6, immunohistochemistry was performed by the Benchmark Ultra system (Ventana) and the ultraView Universal DAB Detection Kit (Ventana) and even counterstaining with hematoxylin-eosin was carried out.
DAPI (4',6-diamidino-2-phenylindole) was used for nuclear counterstaining (Molecular Probes).
For tagging, chromogen diaminobenzidine (DakoCytomation, Carpinteria, CA, USA) was used for 10 min, and Mayer's Hematoxylin was used for the counterstaining. Reactions were performed with negative and positive controls.
Immunostaining of CD45 and counterstaining with hematoxylin; scale bar =100 [micro]m.
The appearance of DAPI enhanced regions subsequent to FISH procedure and DAPI counterstaining (FISH DAPI+ bands), that in fact mimic the C-banding pattern, is described in Moscone et al.
Slides were dipped in a solution of haematoxylin that is diluted 1:1 in distilled water and stained for one minute to produce a very light nuclear counterstaining. Washed for 1 min.
Biotin-conjugated goat anti-rat IgG antibody (Jackson ImmunoResearch Laboratories, West Grove, PA, USA) was used as a secondary antibody, followed by incubation with a streptavidin-biotin complex (Vector Laboratories, Burlingame, CA, USA) and subsequent development with 0.4% 3-amino-9-ethylcarbazole for 5 minutes and counterstaining with Gill's Haematoxylin.
The percentages of replicated [beta]-cells were determined by immunofluorescent assays using anti-insulin and anti-BrdU or anti-Ki67, followed by counterstaining with DAPI.
We then allowed the color to develop with DAB for 30 min, by adding the peroxidase-labeled streptavidin dropwise, incubation at 37[degrees]C for 20 min, followed by mounting after counterstaining with hematoxylin.
For nuclear counterstaining, the cells were treated for 5 min with 4',6-diamidino-2-phenylindole (DAPI) (Beyotime Bio., China) solution.
Counterstaining of stereocilia was performed using phalloidin labeled with tetramethyl rhodamine isothiocyanate (TRITC-phalloidin, 1:200; Sigma, St.
To detect the distribution of iron particles in the tumor, either within tumor vessels or taken up by macrophages, both anti-CD31 and anti-CD68 (Abcam) immunohistochemistry with iron particles counterstaining were performed on one tumor model randomly selected from each treated subgroup.
Chromosome/nuclei counterstaining was performed by DAPI staining and a total of three hundred metaphase cells were microscopically analyzed for each probe set employed.
The biopsy material was stained with Silver Methenamine with H&E counterstaining. Gram-positive hyphae/pseudohyphae can be appreciated.
Slides were rinsed twice in PBS (10 min each), and nuclei were then distinguished by counterstaining with Hoechst 33258 stain (Sigma-Aldrich, Darmstadt, Germany).