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Searching for a live cell staining method - (Dec/15/2011 )

Dear all, I would like to lable my cells in a cell culture with a membrane permeable dye and, after mixing them with unlabelled cells, let them growth further, but actually just for a couple of passages. I am looking for a transmittable dye (which transmits to daughter cells), but stains only living cells and not apoptotic, and which is not transmitted to the other cells in the cell mixture, which were previously unlabelled. Does anyone know such a dye?? Thanks in advance!!!

-Natalia KH-

How about DiI