EGFR overexpression in TACE deficient OPs overcomes the defects in oligodendrogenesis and SCWM myelination during postnatal development. A, Immunofluorescence analysis of EGFR activation levels (pEGFR) in oligodendroglial cells (CC1+) at P15 in the SCWM of NG2-cre:TACEfl/fl:CNP-hEGFR mice. B–E, Immunofluorescence analysis and quantification of caspase3+ cells (B, C), proliferating OPs (NG2+BrdU+; E), pre-OLs (CC1+; D, E), and mature myelinating OLs (GSTπ+; D, E) in the SCWM at P15. F, Immunofluorescence analysis of MBP expression in the SCWM of NG2-cre:TACEfl/fl:CNP-hEGFR mice and their littermates at P15. G, Western blot analysis and quantification of myelin-related proteins levels in the SCWM of NG2-cre:TACEfl/fl:CNP-EGFR mice and their littermates at P15. Data are shown as mean ± SEM. n = 6–8 brains for each genotype. Cell numbers are expressed as the number of positive cells per mm3 (×1000). Scale bars: A, B, D, 20 μm; F, 100 μm. **p < 0.01 versus NG2-cre:TACEw/w; ##p < 0.01, ###p < 0.001 versus NG2-cre:TACEfl/fl mice.