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Double labeling for RII (15 nm gold particles) and CFTR (10 nm gold particles) in parotid striated duct cells. RII is present along the luminal membrane and associated with apical granules and vesicles. CFTR is mainly associated with granules and vesicles; gold particles representing CFTR also are associated with the luminal membranes (arrows). Arrowheads indicate granules and vesicles labeled for both RII and CFTR. Scale bars = 0.25 μm; upper inset = 0.1 μm.
