Xylogalacturonan exists in cell walls from various tissues of Arabidopsis thaliana

Representation of the proposed action of XGH towards a specific part of a XGA molecule which shows the release of the oligosaccharide GalA4.
-  = GalA, X = xylose, o = GalA of the continuing chain of the galacturonic acid backbone. The asterix (∗) indicates the reducing end.