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Installation of chromosome axis and SC proteins on meiotic chromosomes in phs1 mutants in Arabidopsis and maize. (A) Installation of ASY1, a chromosome-axis associated protein in zygotene meiocytes. (B) Installation of ZYP1, the central element protein of the SC, and AFD1, a meiosis-specific cohesin, in pachytene. (Scale bar, 5 μm.)
