Additional Supporting Information may be found in the online version of this article.

IBD_21849_sm_SuppFig1.eps60KSupporting Information Figure 1. Linear regression plots for Tryptophan and Kynurenine assay by HPLC. Graphs show standards based plots for L-kynurenine and L-tryptophan spanning a concentration range of over 2 orders of magnitude shown in complete (left) and with an expanded lower dose range (right). Best fit slope: Tryptophan (43,774); Kynurenine (36,123).

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