Have to disagree with you on this. The Exblate ultrasound works by sending high intensity waves to non-invasively heat and destroy tissue. The procedure for PD is a subthalatomy, which is a lesioning of the subthalmic nucleus. Specifically, the procedure destroys the subthalmic nucleus (which is part of the basil ganglia and next to the substantia nigra). The purpose of this procedure is to destroy cells. Are the cells abnormal? Call it what you like, but they are definitely not normal brain cells anymore. If they were, we wouldn't have PD.