Don’t get too excited as it is only in mice at this stage. 

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2.1 Animals

All experiments were conducted with the approval of the ethical committee of the University of the Basque Country (UPV/EHU). Animals were handled in accordance with the European Directive 2010/63/EU and were housed under standard conditions with a 12 h light–dark cycle and ad libitum access to food and water. All possible efforts were made to minimize animal suffering and the number of animals used. Sprague Dawley rats, C57BL/6 mice, and transgenic mice expressing fluorescence reporter DsRed under the control of the glial-specific proteolipid protein promoter (PLP-DsRed; Hirrlinger et al., 2005), generously provided by Prof. Dr. F. Kirchhoff (University of Saarland, Homburg, Germany), were used in this study.
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https://multiplesclerosisnewstoday.com/news-posts/2022/08/22/ms-spasticity-therapy-baclofen-helps-with-remyelination/