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tRNA fragment distribution among different poplar wood tissues and leaves. (A) Length distribution of tRNA fragment (tRF) tags indicating abundant 19-nt tRFs in xylem tissues. (B) High-confidence 19-nt tRFs (P value <0.01) identified among all of the tissues. (C) Expression heatmap of high-confidence 19-nt tRFs revealing high expression dynamics of tRFs in woody tissues.
