3.5 µg of the FOXP3 promoter luciferase reporter vector or a combination together with the RUNX1, RUNX3 pEGFPN1 vector, and 0.5 µg phRL-TK were added to 3 × 106 CD4+ T cells resuspended in 100 µl of Nucleofector solution (Lonza) and electroporated using the program U-15.