In situ hybridization using a proteolipid protein (Plp1) riboprobe was performed as previously described [55 (link), 56 (link)]. The Enpp6 plasmid vector (pCMV-SPORT6, gift from Dr. William D. Richardson, University College London) was used to generate the Enpp6 riboprobe (Xiao et al. 2016 [57 (link)]). In 15 μm coronal cryosections, hybridized Plp1 or Enpp6 riboprobe was detected with alkaline phosphatase-conjugated sheep anti-digoxigenin antibody and incubation in substrate solution (nitroblue tetrazolium chloride/5–bromo-4–chloro-3–indolyl-phosphate [NBT/BCIP]; Dako).
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