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A proper number of oligodendrocytes in the nerve system is essential for neuronal functions. In the olfactory bulb (O, enriched oligodendrocytes are crucial for olfactory information processing. However, how the precise number of oligodendrocytes in the OB is regulated remains elusive. Here we identified that the transcription factor 4 (Tcf4)-mediated cell death is essential for generating an appropriate number of oligodendrocyte progenitor cells (OPCs) and thereby oligodendrocytes in the OB. We showed that Nkx2.1-positive progenitor