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TUA and TUB protein localization in aspen stem sections. The most abundant TUA and TUB immunosignals are detected in xylem and phloem fibers of developing stem sections, using polyclonal antibodies raised against recombinant aspen TUA1 (A–C) or TUB peptide (E and F). A preimmune serum was used as control (D). Scale bar = 100 μm. co, Cortex; cz, cambial zone; pf, phloem fiber; ph, phloem; v, vessel; xf, xylem fiber; xy, xylem.
