Figure 5: Transmission electron microscopy (TEM) retrieved from paraffin-embedded block. (a) Apical complex (circle), the special organelle of Apicomplexa. (b) Rhoptries (circle), the special rod-shaped secretion organelles of tachyzoite. (c) Reproduction of intracellular tachyzoite through binary fission (arrow), splitting into two tachyzoites. (d) Magnification view of the splitting tachyzoite