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Catechin fraction A and theaflavin fraction B; BT1, BT2, and BT3 indicate fermentation temperatures of 20, 25, and 30°C, respectively. TF, Theaflavin; TF3G, theaflavin-3-gallate; TF3’G, theaflavin-3′-gallate; TFDG, theaflavin-3,3′-digallate.
