Expansins abundant in secondary xylem belong to subgroup A of the alpha-expansin gene family.

@article{GrayMitsumune2004ExpansinsAI,
  title={Expansins abundant in secondary xylem belong to subgroup A of the alpha-expansin gene family.},
  author={Madoka Gray-Mitsumune and Ewa J Mellerowicz and Hisashi Abe and Jarmo Schrader and Anders Winz{\'e}ll and Fredrik H Sterky and Kristina Blomqvist and Simon Mcqueen-mason and Tuula T. Teeri and Bj{\"o}rn Sundberg},
  journal={Plant physiology},
  year={2004},
  volume={135 3},
  pages={1552-64}
}
Differentiation of xylem cells in dicotyledonous plants involves expansion of the radial primary cell walls and intrusive tip growth of cambial derivative cells prior to the deposition of a thick secondary wall essential for xylem function. Expansins are cell wall-residing proteins that have an ability to plasticize the cellulose-hemicellulose network of primary walls. We found expansin activity in proteins extracted from the cambial region of mature stems in a model tree species hybrid aspen… CONTINUE READING

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