SST and depressive symptom measurement: Decreased PFC SST expression and immunoreactivity is documented in depression, bipolar disorder, and schizophrenia, as well as in amygdala and hippocampus (Beneyto et al., 2012; Fung et al., 2014; Hashimoto et al., 2008; Lin & Sibille, 2015; Morris et al., 2008; Pantazopoulos et al., 2017; Seney et al., 2015; Tripp et al., 2011).