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Reversed phase HPLC chromatograms of the tannins from the last fraction (LF) degraded in the presence of cysteamine; Cat, (+)-catechin; EC, (−)-epicatechin; Cya-Cat, 4β-(2-aminoethylthio) catechin; Cya-EC, 4β-(2-aminoethylthio) epicatechin.
