Answer to Parasite Case of the Week 697: Entamoeba hartmanni cyst and trophozoite.
As noted by Florida Fan, Clinton White, TheOracle, and many others, the trophozoite has the classic Entamoeba-type chromatin pattern (peripheral ring of condensed chromatin and a central dot-like karyosome), whereas the size of the troph and cyst are characteristic of Entamoeba hartmanni. Thanks again to Idzi Potters for donation of another excellent case!
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