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Fig. 1. Colocalization of Rab proteins with secretory vesicles in PC12 cells. NPY-Venus (A,D,G,J) and mRFP-Rab3A (B), mRFP-Rab27A (E), mRFP-Rab33A (H) or mRFP-Rab37 (K) were coexpressed in PC12 cells, and images of the fixed cells were obtained by confocal microscopy. Note that all four mRFP-Rabs colocalized well with the dense-core vesicle marker NPY-Venus. Bars, 5 µm.