1X10^6 C57BL/6 mouse splenocytes were surface co-stained with 0.25 ug FITC Plus Anti-Mouse CD4 (GK1.5) (FITC-65104, Clone: GK1.5) and 0.5 ug CoraLite® Plus 647 Anti-Mouse CD3ε (CL647-65060, Clone:145-2C11) or 0.5 ug CoraLite® Plus 647 Armenian Hamster IgG Isotype Control (PIP) (CL647-65210, Clone: PIP). Cells were not fixed.