Factors underlying a latitudinal gradient in the S/G lignin monomer ratio in natural poplar variants - Weiwei Zhu; Jin Zhang; Pradeep Kumar Prabhakar; Yen On Chan; Rachel A. Weber; Mengjun Shu; Ganesh Panzade; Connor J. Cooper; Russell B. Davidson; Jin-Gui Chen; Sara S. Jawdy; Jerry M. Parks; et al. (Proceedings of the National Academy of Sciences, 2025)