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Fig. 1. Silver staining of spread nuclei at meiotic prophase in wild type and swi1-2 mutant. (A-D) Wild-type meiotic prophase. (A) Leptotene, axial elements appear. (B) Zygotene, synapsis is progressing. (C) Pachytene, synapsis is completed. (D) Diakinesis; five bivalents are condensing. (E-H) swi1-2 meiotic prophase. Ten univalents progressively condense without any sign of an axial element or synapsis. Scale bar: 10 µm.