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Phe and Tyr balance and kinetics across kidney. (A) Phe and Tyr balance. There was a net uptake of Phe (2.2 ± 0.3 μmol/min) across the kidney and a net release of Tyr (−5.2 ± 1.5 μmol/min). (B) The kinetics of Phe and Tyr. Ra(Phe) was lower than Rd(Phe) (P < 0.01). Ra(Tyr) is higher than Rd(Tyr) (P < 0.01). Phe conversion to Tyr (5.2 ± 1.2 μmol/min) also was higher than Rd(Tyr) (1.8 ± 1.0 μmol/min) (P < 0.01).
