Activated HGF c Met Axis in Head and Neck Cancer Hepatocyte Growth Factor MET Activator Rescues Working Memory Deficits after Repeated Mild Traumatic Brain Injury Katelyn A. Martino, Arush Nakhre, Renee M. Demarest, David M. Devilbiss, 2025 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 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