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AP1Gs are expressed in synergid cells. (A and B) RNA in situ hybridization with antisense (A) or sense (B) probe for AP1Gs. (C and D) Representative histochemical GUS staining of ProAP1G1:GUS (C) or ProAP1G2:GUS (D) transgenic plants. (Scale bars: A and B, 100 µm; C and D, 50 µm.)