1x10^6 C57BL/c mouse splenocytes were intracellularly stained with 0.25 ug Anti-Mouse Foxp3 (3G3) (65089-1-Ig, Clone: 3G3) or 0.25 ug Mouse IgG1 Isotype Control (MOPC-21) (65124-1-Ig, Clone: MOPC-21), FITC anti-Mouse IgG1 Antibody, and CoraLite® Plus 647 Anti-Mouse CD4 (GK1.5) (CL647-65104, Clone: GK1.5). Cells were fixed and permeabilized with Transcription Factor Staining Buffer Kit (PF00011).