Fig. 1
From: The energy metabolism of Balantidium polyvacuolum inhabiting the hindgut of Xenocypris davidi
Transmission electron micrographs of B. polyvacuolum. (A) The whole body of (B) polyvacuolum, with macronucleus (Ma) visible. (B) The distribution of starch granules (SG), a lysosome (Ly) and endosymbiotic bacteria (B), with the arrow showing dividing bacteria. (C) A magnification of bacteria, showing the cell wall and nucleoid. (D) The positional relationship between starch granules (SG), mitochondrion-related organelles (MRO), vacuoles (V) and kinetosomes (Ks). (E) Different shapes of dividing MROs. (F) Arrows show the rough endoplasmic reticulum (RER) around the MROs and arrowheads show the dumbbell-shaped MROs