Hypoglycemic activity of Coccinia indica and Momordica charantia in diabetic rats: depression of the hepatic gluconeogenic glucose-6-phosphatase and fructose-1,6-biphosphatase and elevation of both liver and red cell shunt enzyme glucose-6-phosphate dehydrogenase - Shibib,B.A.; Khan,L.A.; Rahman,R. (Biochemical Journal, 1993)