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GUS expression directed by AtHB7 or AtHB12 promoters depends on the stage of development. Histochemical detection of GUS enzymatic activity in pAtHB7::GUS and pAtHB12::GUS plants of 14-, 23- and 45-day-old as indicated. (A), (B), (C): AtHB12 promoter and (D), (E), (F): AtHB7 promoter. View of root tips, cotyledons, petioles and nervations (A); petioles and nervations (B); leaves, flowers and siliques (C); leaves and cotyledons (D and E); senescent leaves (F).
