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RNA in situ localization of CAld5H, BLH6, BZIP34, and bHLH59 in the 8–9 internode stems of P. alba × P. glandulosa stems. Bars = 200 μm. Arrows show the signals of the vessels (Ve), fiber cells (Fc), and phloem fiber cell (PFc) in the differentiating xylem where signals of RNA in situ hybridization were intensified. AS and S represent the sections hybridized with antisense and sense probes, respectively.
