Linden , M., Helmbold , K., Kempf , J., Sippas , S., Filss , C., Langen , K.-J., Eisert , A. and Zepf , F.D. 2016. Dietary tryptophan depletion in humans using a simplified two amino acid formula - a pilot study. Food & Nutrition Research. 60, (Dec. 2016). DOI:https://doi.org/10.3402/fnr.v60.29272.