Studies have also found decreased expression of neurotrophins, such as BDNF, TrkB, nerve growth factor (NGF), and its receptor TrkA, at both protein and mRNA levels in the postmortem brains of suicide victims, emphasizing the role of these factors in the pathophysiology of depression and related behaviors (Erbay et al., 2021). The gene discussed is NGF; the disease is depressive symptom measurement.