Figure 1. Major diet-derived polysaccharides and microbial carbohydrate-degrading enzyme activities. The enzyme families most associated with particular activities in gut bacteria are indicated as follows: GH, glycoside hydrolase; PL, polysaccharide lyase; CE, carbohydrate esterase; G, glucose; F, fructose; X, xylose; A, arabinose; GalU, galacturonic acid; GluU, glucuronic acid. [For details refer to the CAZY website (/www.cazy.org/)].