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Fluorescent probes for labeling and imaging secretory vesicles. FM1-43 is fluorescent in the membrane but nonfluorescent in the solution. pHluorin and FFN102 are weakly fluorescent in the lumen of secretory vesicles (pH < 6), but emit much stronger fluorescence during exocytosis when they are exposed to the extracellular medium (pH 7.3).
