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The predicted regulatory relationship of homologs of xylem development gene in P. trichocarpa by extracting co-expression relationships from WGCNA network. (A) genes up-regulated in May in elm; (B) genes up-regulated in June in elm. The homolog genes of libriform fibers (Ptr7)/vessel elements (Ptr1)/ray parenchyma cells (Ptr8) were represented by red/blue/pink.
