Synaptogenesis Springer Nature Link Frontiers Survey of transcriptome analyses of hippocampal neurogenesis with focus on adult dentate gyrus stem cells Dihexa (also known as PNB 0408) is an experimental small molecule derived from angiotensin IV. It was engineered to cross the bloodbrain barrier and has shown synaptogenic effects in preclinical models. The often quoted A Single Cell Perspective on Remapping Human Adult Neurogenesis and Its Clinical Implications