Transverse sections of 26-day treatment groups. Midpoint 20- μm transverse sections from the 26-day treatment groups stained in 1% Chlorazol Black E in methoxyethanol and 1% Safranin O (aqueous) of (A) control tree, (B) 2,6-dichlorobenzonitrile (DCB)-treated tree, (C) tension wood-induced tree and (D) tension wood-induced, DCB-treated tree. Scale bar = 1 mm. (E) Tension wood-induced, DCB-treated tree. Scale bar = 100 μm. Tension wood- and DCB-affected regions are highlighted by vertical double arrows.