5-Carboxyfluorescein diacetate N-succinimidyl ester / 5-FAM DA SE

5-CFDA is membrane-permeant and thus can be loaded into cells via incubation. Once inside the cells, 6-CFDA is hydrolyzed by intracellular esterases to 6-carboxyfluorescein. Reagent for continuously determining the intracellular pH in bacteria by fluorometry. Labeling human intervertebral disk cells in vitro for fluorescence microscopy.