FOXP3 and neoplasm: Visualization of intracellular FOXP3 among the splenocytes and tumor‐infiltrating leukocytes from tumor‐bearing TRAF6fl/flFoxp3Cre+ mice revealed that most of the factor detected was found in extranuclear deposits, in stark contrast to the nuclear staining expected and seen in wild‐type controls (Fig EV5A).