7–10. Macronucleus of Euplotes encysticus infected with trypanosomatid flagellate Herpetomonas sp. Ind3. 7. General view of a heavily infected nucleus. 8. Part of the nucleus with several trypanosomatids (arrowheads). 9. Promastigote trypanosomatid released from the crushed macronucleus. 7–9. Living cells, DIC contrast. 10. Feulgen-staining. Highlighted are the host’s micronucleus (Mi) and macronucleus (Ma), the latter is infected with numerous flagellates; dark spots (arrows) represent nuclei and kinetoplasts of the parasites. Bars = 10 μm (7, 10), 5 μm (8, 9).