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Fig. 6. Loss of H3K9m2 from centromeric heterochromatin, but not from X and Y in Hr6b-knockout diplotene spermatocytes and spermatids. Immunostaining with anti-H3K9m2 (green) and anti-SYCP3 (red) of wild-type (A) and Hr6b-knockout (B) early (eD) and late (lD) diplotene spermatocytes (upper panels), and round spermatids (spt) (lower panels). DNA is stained with DAPI (blue). Arrowheads indicate the XY body. Bar, 10 µm.