Multicolor flow cytometric analysis of Tregs was performed as described previously [17 (link)]. Monoclonal antibodies (mAbs) with specificity against CD4 (RM4-4), CD25 (7D4), CD62L (Mel-14), and CTLA4 (UC10-4F10-11) were used. For intracellular staining, FoxP3 (FJK-16s) Staining Kit (eBioscience) was used according to the manufacturer's protocol. PI was used for dead cell exclusion when appropriate. Surface staining was performed according to standard procedures, and flow cytometric analysis was done on Coulter Cytomics FC500 using CXP software (Coulter, Austria) for acquisition and analysis.
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