Fig. 4
Electron microscopic images of MCF-7CC10 and MCF-7DOX2–10 cells. Differences in the ultrastructure of MCF-7CC10 cells (panel a) and MCF-7DOX2–10 cells (panel b) were visualized by transmission electron microscopy, with Figures c and d depicting boxed sections in panels (a and b) at a higher magnification, respectively. Arrows indicate the presence of mitochondria being engulfed by double membrane structures. Five representative images were taken, with 1 image of each cell lines being depicted in the figure