Cell permeable fluorescent dye that binds to A:T pairs in DNA. Useful for the simultaneous study of the cell cycle and apoptosis in unfixed cells. Also useful for controlling gene expression through binding to RNA aptamers inserted into 5' untranslated region of a messenger RNA. Induces cell differentiation. About 10 times more cell permeable than bisbenzimide H33258 (Prod. No. ALX-620-051). Ex(max): 346nm; Em(max): 460nm.