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Fig. 7. Me(3)K20H4 is present in mature sperm. Hypotonically swollen sperm stained with DAPI (A) and anti-Me(3)K20H4 antibodies (B). (C) Merged image of A and B. Me(3)K20H4 staining colocalises with the bright (AT-rich) DAPI staining blocks. Me(3)K20H4 staining of the sperm is weak; when compared to the single spermatid, below the sperm cells (the `double-dot' staining), the intensity of the Me(3)K20H4 staining in the sperm cells is weak, but detectable. Scale bar: 5 µm.