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Polyphenols contents in grape skins, seeds and wines under different treatments. R, red. W, white. B, black. CK, control group. TFD, total flavonoids. TP, total phenols. TT, total tannins. TA, total anthocyanins. TFA, total flavanols. Different letters indicate significantly difference values (p < 0.05). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
