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Transverse sections of 15-day-old birch seedlings germinating under GA3 and/or PAC. The hypocotyl base was sectioned 15 days after germination. (A) Toluidine blue staining analysis of the differentiation of xylem. xy, xylem cell. Bars = 50 μm; (B) The diameter of the hypocotyl (μm); and (C) The number of xylem cell. Lower case letter indicates p < 0.05.
