Figure 1

Annotated high-resolution, solution-state 2D ¹H–¹³C HSQC NMR of a wild-type Arabidopsis spectrum in the A) lignin aromatic, B) polysaccharide anomeric, and C) lignin-polysaccharide regions. The rectangular boxes denote ROIs that correspond to assigned NMR transitions (colored boxes with annotations) or simply resolved regions of the spectrum that have yet to be assigned (gray boxes). The unassigned regions are associated with an ID that is used to identify them in the feature matrix. To avoid crowding the figure, the ID does not appear as a label. The lowest contour in the figure corresponds to an intensity level of 3 SD of rms noise.