1X10^6 mouse splenocytes were surface co-stained with CoraLite® Plus 647 Anti-Mouse CD3, and 0.2 ug Anti-Mouse CD4 (65141-1-Ig, Clone:RM4-5) and FITC-Goat anti-Mouse IgG at dilution 1:100 or 0.2 ug Isotype Control and FITC-Goat anti-Mouse IgG at dilution 1:100. Cells were not fixed.