Fig. 1.

Location of monosaccharide transporters in enterocytes that are involved in small intestinal absorption of d-glucose, d-galactose, and d-fructose. The locations were determined in different species including humans. Highly expressed transporters are outlined bold. Locations of monosaccharide transporters observed under various physiological and pathophysiological conditions are indicated in green. GLUT2 that was only observed in the BBM at high small intestinal d-glucose concentrations or in some pathological conditions is indicated in yellow. The Na⁺+K⁺-ATPase in the BLM generating the inwardly directed Na⁺ gradient is also depicted