Cells were transduced to express mCherry-tagged Rab proteins, infected with PRV 486 expressing gM-pHluorin, and imaged at 4.5–5 hr after PRV infection. (A,D,G,J) The indicated Rab proteins are not present at gM-pHluorin exocytosis event (green circle). Images correspond to Movie S5. Scale bar represents 2 µm. (B,E,H,K) Kymographs of indicated Rab protein (red) and gM-pHluorin (green) fluorescence over time. (C,F,I,L) Ensemble averages of gM-pHluorin (top, green line) and indicated Rab protein (bottom, red line) relative fluorescence. Shaded area represents standard deviation. (A–C) mCherry-Rab3a. Data represent 38 exocytosis events in 2 independent experiments. (D–F) mCherry-Rab27a. Data represent 23 exocytosis events in 2 independent experiments. (G–I) mCherry-Rab5a. Data represent 37 exocytosis events in 2 independent experiments. (J–L) mCherry-Rab7a. Data represent 30 exocytosis events in 2 independent experiments.