Extended Data Fig. 3: Homogalacturonan molecule schemes and their 13C chemical shift index.

Schemes illustrate 31 and 21 HG conformations and not intended to be conformationally accurate. Yellow circles highlight GA carbons from GAC1-GAC5, pink circles highlight GAC1 and GAC4 in their 21 conformation, blue circles highlight methyl-esterified GAC6, green circles highlight carboxylate GAC6, turquoise circle represent αGAC1re and purple circle represent βGAC1re. Chemical shifts in green represent HG carbons and chemical shifts in pink represent the changes in 21 HG conformation, as presented in Fig. 3.