PVALB and post-traumatic stress disorder: In contrast, a wide range of GABAergic cell types, including SST+, PVALB+, and LAMP5+ inhibitory neurons, as well as endothelial cells, microglia, and oligodendrocytes showed strong enrichment of genes that were down-regulated in patients diagnosed with either MDD or PTSD (Fisher’s exact test, P < 0.001).