Fig. 4. Electron micrographs showing marked structural transformation of mitochondria in 
cells. (A,C) Vegetatively growing Ax-2 cells have normal-shaped mitochondria, whereas (B,D) 
cells have markedly transformed mitochondria having a sort of vacuoles (arrows), engulfing the nearby cytoplasm. Mt, mitochondria; N, nucleus. Bars, 1 µm.