Quoted: Although he?s concerned that myelination seen in mouse models might not ?scale up? to a disease as severe as Pelizaeus-Merzbacher in humans, Ian Duncan, a neuroscientist at the University of Wisconsin, Madison, describes the study as setting a precedent for translating animal research in stem cells to humans. If you could improve quality of life by targeting key areas of the brain with these cells, he says, ?that would be a huge advance.?