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Temporal and spatial expression of GUS in Arabidopsis floral AZs and developing siliques from ProAUX1::GUS (A), ProLAX1::GUS (B), and ProLAX3::GUS (C) plants. The time course of expression is shown from floral development positions 2 to 16, where position 1 is the first flower where petals are visible to the eye. Bars = 1 mm.
