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. 2011 Jul 14;49(2):115–120. doi: 10.3164/jcbn.10-146

Fig. 2.

Fig. 2

Effect of lysine intake on production of 13CO2 from the oxidation of L-[1-13C] phenylalanine (F13CO2).(8) Illustrated is the oxidation response of phenylalanine at varying dietary intakes of lysine. The breakpoint in the oxidation responses has been proposed as the physiological requirement of the test indispensable amino acid for the average individual in the population. The estimated mean lysine requirement according to Zello et al.(8) is 36.9 mg/kg/d.