Refanezumab (GSK249320) is an IgG1-type humanized monoclonal antibody directed against myelin-associated glycoprotein (MAG). Refanezumab binds to MAG and blocks MAG-mediated inhibition of axonal regeneration. Refanezumab can cross the blood-brain barrier (BBB) in animal stroke models. Refanezumab has the potential for the enhancement of recovery of function poststroke.