EL4 thymoma cell lines were s.c. injected into the shaved flanks of Usp44fl/flFoxp3Cre+ mice and their wild type (Usp44fl/flFoxp3Cre-) littermates (1x105 cells/mouse; n=5-9 mice/group). Tumor dimensions were measured every 2 days, and changes in the mean tumor volume over time were observed (lower panels). Upper panels depict representative photographs of excised tumors. 