A nanotechnology treatment derived from bone marrow stem cells has reversed multiple sclerosis symptoms in mice and could eventually be used to help humans, according to a new study led by University of California, Irvine researchers. “Until now, stem cell therapies for autoimmune and neurodegenerative diseases have produced mixed results in clinical trials, partly because we don’t know how the treatments work,” said corresponding author Weian Zhao, an associate professor of pharmaceutical sciences and biomedical engineering who is affiliated with the Sue & Bill Gross Stem Cell Research Center.