Stem cell transplantation can reverse stroke damage, researchers at the University of Zurich report. Its beneficial effects include regeneration of neurons and restoration of motor functions, marking a milestone in the treatment of brain disorders.

When someone has a stroke - a leading worldwide cause of death and disability - time is of the essence. Almost nine out of 10 cases are ischemic strokes, caused by restricted blood flow in the brain, and the current gold-standard treatment that breaks up blood clots must be delivered within four and a half hours of symptoms appearing.