Web Figure 15.7.A
Structure of biologically active oligosaccharins. (A) Oligomers of galacturonic acid are released during pectin degradation. The most active fragments are 10 to 15 residues long. (B) Three oligosaccharins derived from xyloglucan. (C) An oligosaccharin derived from the degradation of fungal (Phytophthora) cell walls. Such oligosaccharides stimulate defense responses.
(Click image to enlarge.)