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Two independent representative ChIP assays of DNA-PKcs, Ku70, Ku86, and SAFB1 interactions with hXOR promoter in PFSK-1 cells. Bands are the PCR products (a 286-bp fragment of the hXOR promoter). A and B are images showing two independent results. In A each antibody essay was performed in triplicate (1–3, 4–6, 7–9, 10–12), whereas in B each was performed in duplicate (1 and 2, 3 and 4, 5 and 6, 7 and 8, 9 and 10).
