CD11b+ CD11c+ dendritic cells were enriched from WT or Rab39a KO spleens via magnetic negative selection. Cells were fed with 3 µm biotin-ova-magnetic beads for 4 hours. Phagosomes were extracted, permeabilized and stained for the indicated proteins. For ROS measurements, phagocytosis was performed with 5 µM CellROX and the phagosomes were not permeabilized. For analysis, the background fluorescence of unstained beads was subtracted from the resulting phagosome gMFI and the fold change of target (dox/no dox) was calculated. Shown are three independent experiments combined. Error bars show SD between experiments. p values were calculated using two-tailed ratio-paired Student's t-test. 