Longitudinal observation of fractional anisotropy (FA) maps and calculation of the ratio of FA(ipsilateral)/FA(contralateral) demonstrated progressive white matter injury (ratio < 1) with a slow recovery in the EC of vehicle-treated stroke mice at 14–35 d after stroke, which was significantly improved by day 28 following stroke in IL-4-treated mice (Fig 4C). Here, IL4 is linked to Stroke.