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NPA treatment inhibits ABPH1 expression in the SAM. Longitudinal sections of maize shoot apices processed for ABPH1 in situ hybridization. Two-week-old maize seedlings were grown on MS medium without NPA for 10 d (A) or with 30 μm NPA for 5 d (B), 10 d (C), or 14 d (D). Arrows indicate ABPH1 expression (A) and residual weak expression (D). Bars = 100 μm.
