Cell suspension from naïve and iTreg skewing cells stained as described 45 (link) using mouse anti-CD4 (BD-Pharmigen), rabbit anti-Smyd3 (Abcam), goat anti-rabbit Alexa Fluor 568, and anti-mouse Alexa Fluor 488 (Invitrogen). The stained tissue sections were analyzed using a Nikon A1 confocal microscope system (Nikon Instruments).