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![Aldose reductase and polyol pathway [19], [NADPH: Nicotinamide adenine](https://www.researchgate.net/publication/356143316/figure/fig1/AS:1093422622474241@1637703676609/Aldose-reductase-and-polyol-pathway-19-NADPH-Nicotinamide-adenine-dinucleotide.png)