Error in Byline and Affiliations. In the Reply Letter titled “How Safe Could Intrathecal Transplantation of Mesenchymal Stem Cells Be Considered in Multiple Sclerosis? In reply” by Karussis et al, published in the July issue of the Archives (2011;68:955-956), a degree was missing from the byline and the affiliation was incorrect. Oded Abramsky, MD, should be Oded Abramsky, MD, PhD. Also, the affiliation for all authors should be The Center for Multiple Sclerosis and the Agnes Ginges Center for Human Neurogenetics, the Department of Neurology, Hadassah University Medical Center, Jerusalem, Israel.