NG2 and GFAP co-expression after differentiation in cells transfected with mutant GFAP and in undifferentiated glioma cells U. Gómez-Pinedo; S. Sirerol-Piquer; M. Durán-Moreno; J.A. Matias-Guiu; J.A. Barcia; J.M. García-Verdugo; J. Matias-Guiu;