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GUS staining of pNPF4.6:gNPF4.6-GUS plants. (A) A rosette (approximately 3 weeks old). Scale bar = 1 cm. (B) Close-up view of a leaf from (A). (C) Close-up view of the leaf surface. Arrowheads indicate guard cells. V denotes vascular tissues. (D) Close-up view of a pair of guard cells. Scale bar = 20 μm. Plants were grown in continuous light.
