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[Entamoeba histolytica]

A	B

A, B: Iodamoeba buetschlii cysts.  The cyst (line drawing, A; trichrome stain, B) have only one nucleus with a large, usually eccentric karyosome.  They do not have chromatoid bodies but have a compact, well defined glycogen mass.  The cysts measure usually 10 to 12 µm (range 5 to 20 µm) and their shape varies from ovoidal to rounded.