FIG. 4.
Binary fission (A) and invasion of the amoebal cytoplasm (B) by reticulate bodies. Hall’s coccus (A) and the BN9 endosymbiont (B) are shown. Electron micrograph; magnifications, ×18,400 (A) (bar = 300 nm) and ×4,600 (B) (bar = 1 μm).
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