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Requirement of PHR1 activity for efficient endoreduplication. (A–D) Representative DNA ploidy distributions of leaf 5 of 25-day-old Ler wild-type (WT) (A, B) and PHR1KO (C, D) plants, either untreated (A, C) or irradiated with 34 kJ/m2 UV-B 15 days after sowing (B, D). (E) Endoreduplication index. Data are represented as mean±s.e. (n=10).
