Fig. 8.

Segment-specific expression of genes coding for various secreted digestive enzymes and involved in fatty acid, vitamin, and iron uptake. This figure illustrates the relative distribution of genes encoding digestive enzymes released into the lumen of different segments as well as proteins involved in uptake of fatty acids, vitamins, and iron in the GI tract that are selectively expressed in epithelial cells of gastric corpus compared with PSB and DSB, and colon in 3 independent experiments (log of the mean of 3 ratios ± SD). Ratios are presented as heat maps showing gradients of highest (red) to lowest (green). The color scale at the bottom indicates the expression ratios (fold-change).