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Mid-pachytene spermatocytes of Sorex araneus. Double immunostaining with antibodies: a–c anti-SYCP3 (green)/anti-ubiH2A (cyan) d–f anti-SYCP3 (green)/anti-SUMO-1 (yellow) g–i anti-SYCP3 (green)/anti-RNA Pol II (blue) j–l anti-SYCP3 (green)/anti-γH2AFX (violet). The true sex chromosome region is designated as XY1. Scale bars: 5 µm.
