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6-Carboxyfluorescein diacetate - is used to differentiate apoptotic cells from viable cells. The difference comes from the fact that live cells that are not apoptotic accumulate 6-carboxyfluorescein but do not accumulate annexin.
C 5748 (OTTO) 6-Carboxyfluorescein diacetate, ~ 95% Cas 3348-03-6 - used to differentiate viable cells from apoptotic cells.