Lymphocytes were isolated from spleen, as described above. According to the method described in our previous studies [3 (link), 40 (link)], surface staining was performed by incubation with surface markers, including phycoerythrin-(PE)-labeled anti-mouse CD3, allophycocyanin (APC)-labeled anti-mouse CD4, and fluorescein isothiocyanate (FITC)-labeled anti-mouse CD8 (eBioscience). The cell suspension was then fixed with FACScan buffer (PBS containing 1% BSA and 0.1% sodium azide) and 2% paraformaldehyde. All data were acquired through a FACScan flow cytometer (BD Biosciences, USA). The analysis was performed with the data from three independent experiments.
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