Rab39a KO and WT mice were injected intravenously with 1 x 105 A20-Ova cells. The next day, CFSE labeled OTI-splenocytes were injected i.v.. 3 days post OT-I transfer, spleens were harvested and assayed for OT-I proliferation. Three independent experiments (WT vs KO) were performed. To combine the data, the OT-I proliferation in each individual mouse was normalized to the average proliferation of the WT controls in that experiment. Error bars show SD between individual mice and p value was derived from two-tailed student's t-test. n = 14 (WT) or 9 (KO). 