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Expression of the chromosomally located lacZ (A) and PHO5 (B) coding sequences under the control of the PHO5 promoter in wild-type and hpr1Δ cells. For repression (+Pi, shaded bars) and induction (−Pi, open bars) conditions see Materials and Methods. Acid phosphatase and β-galactosidase were assayed in the same culture for each sample. Other details as in Fig. 1.
