PeerJ Plasma BDNF concentrations and the antidepressant effects of six ketamine infusions in unipolar and bipolar depression Stem cell, Granulocyte Colony Stimulating Factor and or Dihexa to promote limb function recovery in a rat sciatic nerve damage repair model: Experimental animal studies ScienceDirect 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 Fix the Hardware First: A Paradigm Shift in Acute and Chronic Traumatic Brain Injury Management HyperCharge Health Brain peptides in Alzheimer's disease pathophysiology and therapeutic advances Cell and Tissue Research Springer Nature Link