Immunohistochemistry was performed as described (Rich et al., 2018 (link)). Primary antibodies were used against olfactory marker protein (Omp; goat, Wako 019-22291, Research Resource Identifier [RRID]: AB_664696; 1:500), Sox10 (rabbit, gift of Vivian Lee, Medical College of Wisconsin, WI, 1:3,000; Meng, Yuan, & Lee, 2011 ; Yardley & Garcia-Castro, 2012 (link)), Tbr1 (rabbit, Abcam ab31940, RRID: AB_2200219; 1:1,000; expression data summarized in File S3) and Tubb3 (neuronal αIII tubulin; mouse IgG2a, clone TUJ1, Covance MMS-435P, RRID:AB_2313773; 1:250). Matched AlexaFluor-conjugated secondary antibodies (Molecular Probes, Thermo Fisher Scientific) were used at 1:1,000. For triple immunostaining, anti-Tubb3 was detected by a biotinylated secondary antibody (goat antimouse IgG2a, Invitrogen, 1:100), followed by Alexa350-conjugated NeutrAvidin (Molecular Probes, 1:100). Slides were mounted with Fluoromount G (Southern Biotech, Birmingham, AL) or Vectashield with 4’,6-diamidino-2’-phenylindole dihydrochloride (DAPI; Vector Labs, Burlingame, CA).
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