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Electron microphotographs of pachytene spermatocytes of P. sungorus (a) and F1 hybrids (b–d) after AgNOR staining. Letters indicate the distal ends of the sex chromosome axes. (a) complete synapsis between Xp and Yq; (b) association between misaligned ends of Xp and Yq; (c) asynapsis of X and Y; (d) asynapsis of X and Y with the Y axis forming self-synapsis fold-back. Bar: 10 µm.
