To begin to better understand how KLF9 expression is affected by recent life event-related stress exposure and gender, we performed in situ hybridization on postmortem hippocampus from 12 subjects with untreated MDD, 10 of whom died by suicide, and 12 controls with no history of neuropsychiatric disease or treatment (Table S1). The gene discussed is KLF9; the disease is major depressive disorder.