Measurements were made of the activities of the NADP+-dependent isocitrate dehydrogenase, malic enzyme and glucose-6-phosphate dehydrogenase in cytosolic supernatants of whole lens and capsule-epithelium. The activities of all three NADP+-dependent enzymes were concentrated in the capsule-epithelium relative to the activities measured in the whole lens. These results show for the first time tha...