Kim YS, Kim NH, Lee SW, Lee YM, Jang DS, Kim JS.Department of Herbal Pharmaceutical Development, Korea Institute of Oriental Medicine, 461-24 Jeonmin-dong, Daejeon 305-811, Republic of Korea.Advanced glycation end products and transforming growth factor-beta (TGF-beta) have been implicated in the development of diabetic complications such as cataract. The diverse metabolic effects of protocatechualdehyde (PCA, 3, 4-dihydroxybenzaldehyde) include the inhibition of aldose reductase and oxidation,  
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