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Principal component analysis of the cytotoxic effect of Pistacia essential oils on 2008 cells. PCA biplot with PC1 and PC2 distribution of essential oil samples and chemical components of the phytocomplexes. Clusters of cooperating compounds with a positive correlation to one or two components are identified with circles (green for P. lentiscus, yellow for P. integerrima, and blue for P. terebinthus).
