E. Subcellular localization analysis of TFEB (red) and TFE3 (green) in RCS chondrocytes treated with FGF18 (50 ng/mL) for 12h. JNK inhibitor was used at 50 μM for 12h. Nuclei were stained with DAPI (blue). Quantification analysis showed % of cells with nuclear TFEB and TFE3 in RCS chondrocytes with indicated treatments. Scale bar 15 μm. Mean +/- standard error of the mean (sem) of N=3 biological replicates. n= 126 cells (control), 126 cells (FGF18), 95 cells (JNK Inhibitor), 163 cells (JNK Inhibitor + FGF18). Student's paired T-test *p<0.05. 