Cells were harvested from the ear and stained with fixable live/dead cell stain (ThermoFisher) (42 (link)). For ex vivo intracellular staining of cytokines, brefeldin A (1 μg/ml) was added to all media and wash buffers to block cytokine secretion (43 (link)). Leukocytes were stained with Abs (Biolegend) to CD45 (30-F11), CD4 (RM4-5) and Thy1.1 (H1S51), fixed with cytofix/cytoperm (BD Biosciences) and stained with anti-IFNγ Ab (XMG1.2). Analyzed by FACS using the BD LSR II.
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