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Phosphate uptake in transgenic tobacco cultured cells carrying the Arabidopsis gene PHT1. Phosphate uptake rates (V; n mol/h per g fwt) in a transgenic cell line carrying p35SPHT1 (P11) (•) and a control cell line carrying pMi12 (C11) (○) were determined by the depletion-curve method (23). [S], phosphate concentration (μM).
