Figure 2.

Gradients of brush-border sucrase activity (▪) and glucose transporter activity (□), measured in everted intestinal sleeves of the same mice, at six locations from proximally to distally along the small intestine. At each location, sleeves used for sucrase and glucose-transporter assays were immediately adjacent to each other. Each point represents the mean value, with standard error bars, for six virgin female mice consuming a 55%-sucrose ration. Ordinate units are mmol glucose (produced by sucrase from sucrose, or taken up by the glucose transporter) per mg of wet mass of intestinal sleeve per min. Sucrase data are from fig. 3 of ref. 12. Note that both activities decline in parallel from proximally to distally, and that at each position the two activities are equal or nearly equal to each other within experimental error.