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Their role in maintaining cell wall rigidity is discussed in chapter 1).Chapter 2 discusses structural features of AGs, subdivided in arabino-beta(1->4)-galactans (type I) and arabino-beta(1->3,1->6)galactans (type II), and gives a brief overview of enzymes degrading galactan structures of AGs.4)-galactans (type I) and arabino-beta(1->3,1->6)galactans (type II), and gives a brief overview of enzymes degrading galactan structures of AGs.3,1->6)galactans (type II), and gives a brief overview of enzymes degrading galactan structures of AGs.6)galactans (type II), and gives a brief overview of enzymes degrading galactan structures of AGs.In chapter 3 the alkaline extraction of type I AGs from potato fibre, onion powder and citrus pomace is described.