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ARR5::GUS activity observed in the xylem rays (A,B) and in cambium (C,D) at the stem bottom of Populus × canescens in the growth phase and during dormancy. (A,C) represent samples from growth phase and (B,D) represent samples during dormancy of line 32. The following abbreviations were used: ry, ray cell; v, vessel; ph, phloem; cz, cambial zone; and xy, xylem. Scale bar = 50 μm.
