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Transgenic mice, which express active Fyn tyrosine kinase under the control of a glial fibrillary acidic protein promoter, have been produced. This promoter induces protein expression in the initiation stage of myelination in the peripheral nervous system (PNS) “Phosphorylation of cytohesin-1 by Fyn is required for initiation of myelination and the extent of myelination during development (Yamauchi et al., 2015 [1])”. Herein we provide the data regarding myelination-related protein markers and myelin ultrastructure in transgenic mice. Keywords: Fyn, Myelination, Peripheral nervous system, Myelin marker protein, Signaling