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Fig. 4. Regression lines for the changes in the area under the plasma insulin curve as a function of the changes in the area under the plasma D-glucose curve in rats receiving either increasing amounts of D-glucose (nil : open circles; 1.4 µmol/g : closed circles; 3.5 µmol/g : crosses; 6.9 µmol/g : open triangles; 13.9 µmol/L = closed triangles; left panel) or increasing amounts of both D-glucose and D-fructose (nil : open circles; 1.7 µmol/g of each hexose : open triangles; 3.5 µmol/g of each hexose : closed triangles; right panel).