Figure 3

Kynurenine metabolites in the plasma of suicide attempters and healthy controls. (a) Plasma picolinic acid (PIC). (b) Plasma quinolinic acid (QUIN). (c) Plasma PIC/QUIN ratio. (d) Plasma kynurenine/tryptophan ratio. (a–d) *P<0.05; ***P<0.001 suicide attempters versus controls. All values represent mean (+s.e.m.).