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Principal component analysis (PCA) biplot of the flavonoids (FLV), total phenolic content (TPC), and the antioxidant activity in Goji extracts. Six replicates in each Goji extract, total 18 loadings were analyzed. Antioxidant activity was loaded as the DPPH radical scavenging effect (DPPH RSE, in %) of 2 mg/mL in each extract. NL, normal uninfected leaves. GL, galled leaves. Fruit, Goji berry
