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Transverse (A and C) and longitudinal (B) surfaces of wild-type (A and B) and transgenic line 64 (C) poplar incubated with Phanerochaete chrysosporium for 16 weeks. Note the sparse amount of mycelium at the advanced stage of degradation. Arrows indicate fiber delignification (A) and formation of bore holes (B), and arrowheads indicate formation of erosion holes in the secondary walls (A).
