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. "10 Amino Acid Flux and Requirements: Counterpoint Tentative Estimates are Feasible and Necessary." The Role of Protein and Amino Acids in Sustaining and Enhancing Performance. Washington, DC: The National Academies Press, 1999.
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Zello, G.A., P.B. Pencharz, and R.O. Ball. 1990. Phenylalanine flux, oxidation and conversion to tyrosine in humans studied with [l-13C]phenylalanine. Am. J. Physiol. 259:E835-E843.
Zello, G.A., P.B. Pencharz, and R.O. Ball. 1993. Dietary lysine requirement of young adult males determined by oxidation of L-[l-13C]phenylalanine. Am. J. Physiol. 264:E677-E685.
Zello, G.A., L.J. Wykes, R.O. Ball, and B. Pencharz. 1995. Recent advances in methods of assessing dietary amine acid requirements for adult humans. J. Nutr. 125:2907-2915.