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Late zygotene stage, V. berus spermatocyte I. Heterochromatin region on the bivalent 6 (HR6) after the synapsis of two homologous chromosomes 6. (a) Chromatin stained with DAPI (blue), (b) Axial elements of chromosomes are immunostained with antibodies against the SYCP3 protein (green), and (c) merge. Bar—10 μm.
