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PPi concentration in transgenic tubers. Developing tuber samples were taken from 12-week-old plants grown in 2.5-L pots in the greenhouse. The PPi concentration was measured in TCA extracts by an enzyme-coupled test. A, Wild-type and transgenic potato lines U-IN2-30 and GK3. B, Wild-type and transgenic potato lines AGP, H-AI, and H-CI. The error bars represent the se for determinations on six individual plants per line.
