COXFA4L2 and glioblastoma: TEM images showed that NDUFA4L2 knockdown cells had a higher number of autophagosomes/autolysosomes than si-NC-treated cells (yellow arrows indicate normal morphology of mitochondria in GBM cells, red arrows indicate abnormal morphology of mitochondria in NDUFA4L2 knockdown cells; red stars indicate autophagosomes, and yellow stars indicate autolysosomes).