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Fluorescence images of cells exposed to X-ray, where a bi-nucleated fibroblast has no micronucleus (A); one micronucleus (B); two micronuclei (C); a nucleoplasmic bridge (NPB) (D); and a nuclear bud (NBUD) (E); the appearance frequency of micronucleus of four samples (F), where cells are arrested at inter-phase stage. “*” (p < 0.05) and “**” (p < 0.01) represent significant difference and extra significant difference, respectively.
