Rate of [15N]leucine incorporation and determination of nitrogenous fractions from gastro-jejunal secretion in fasting humans C. Gaudichon, C. Laurent, S. Mahé, L. Marks, D. Tomé and M. Krempf Reprod. Nutr. Dev., 34 4 (1994) 349-359 DOI: 10.1051/rnd:19940407