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. Author manuscript; available in PMC: 2022 Jul 1.
Published in final edited form as: Brain Behav Immun. 2021 Mar 26;95:216–225. doi: 10.1016/j.bbi.2021.03.019

Figure 1.

Figure 1.

The relationship between Kyn/Tryptophan (A–C, left column) or Kyn/5-HT (D–F, right column) ratios with peripheral immune markers, including IL-1ra (A & D); IL-12p40 (B & E); and IL-18 (C & F). R2 is the proportion of variance explained by a given ratio.