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Activity of phytochelatin synthase in extracts from tobacco plants (wild type var. Xanthi; AtPCS1-expressing lines, PaII4 and PaII12; CePCS-expressing lines, PcII3 and PcII4). Values correspond to means ±SD (n=3); those significantly higher from wild type var. Xanthi are indicated with the arrow (P <0.05).
