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Double-immunoflourescence analysis of Cos-7 cells transfected with human TdT: effect of etoposide treatment. Cos-7 cells transfected with the human TdT expression construct were treated with 2 μM of etoposide in DMSO (C and D) or DMSO alone (A and B) for 3–5 h and fixed. Cells were stained with FITC-αKu (green) or rhodamine-αTdT (red). Both proteins are present only in the nucleus.
