(E) Quantitative analysis of ATP7A, DUSP2, and TTK mRNAs in MB002 following expression of SOX9-WT or SOX9-T236/240A. Total RNA were collected 24 hours following doxycycline treatment, from which cDNA were generated for qPCR. Data are mean mRNA level (normalized to B2M transcript) + standard deviation from 3 independent experiments with statistical significance were determined by Multiple comparisons 2-way ANOVA with Bonferroni's post-test. 