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    • Figure 1. 

      The cross-section of tree trunk shows the wood formation process. CPD, cell proliferation/differentiation; CE, cell expansion; SCW thickening, secondary cell wall thickening; PCD, programmed cell death; v, vessel; xf, xylem fiber; rp, ray parenchyma cell, pf, phloem fiber.

    • Figure 2. 

      Signal molecules and molecular networks identified in cambial cell proliferation and differentiation of trees.

    • Figure 3. 

      Transcription factor genes in regulation of wood secondary cell wall biosynthesis.