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Transmission electron micrographs of male meiocyte nuclei in wild-type (A and B) and atrad51-1 (C–E) plants. SCs (arrows) were observed at zygotene (A) and pachytene (B) stages in wild type. In atrad51-1, the axial elements (arrowheads) remained unpaired in nuclei corresponding to zygotene (C) or pachytene (D) stages; an occasional SC was observed (E). Nu, nucleolus; RN, recombination nodule. (Scale bar, 100 nm.)
