NTRK2 and psychotic disorder: Regarding the role of BDNF in the onset and evolution of psychosis, it is of interest that the expression of the two forms of BDNF receptors (active TrkB-FL and inactiveTrkB-T1) in Peripheral Blood Monocyte Cells (PBMCs) of first episode psychotic patients showed modifications according to the trajectory of the disease, with TrkB-FL expression increasing by 1 year after diagnosis and TrkB-T1 expression decreasing.