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(A–B) Representative images of X chromosome FISH in the A549 cell line (A) with two Xs and HeLa (B) with three Xs. DNA is stained with DAPI (blue), and the X chromosome is labeled with Cy3 (red). (C–D) The distribution of the copy number of X’s among cells from A549 (n = 343) and HeLa (n = 170).
