CCL20 and depressive disorder: Median concentrations of the chemokine MIP-3α were highest in the Control group (1.36 log pg/mL), followed by Depression (1.05 log pg/mL) and mostly undetectable levels in Abuse (-0.67 log pg/mL) and Abuse+Depression groups (-0.67 log pg/mL) (p<0.01) (Fig 2A, Table 2B).