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The correct answers for Fig 3.17 are as follows: top row left and right, Giardia lamblia (G. duodenalis, G. intestinalis) trophozoite, Chilomastix mesnili cyst; next row left and right, Endolimax nana or Iodamoeba bütschlii trophozoite (both look essentially the same in the trophozoite form), Entamoeba coli cyst; next row left and right, Dientamoeba fragilis trophozoite, Blastocystis spp.; next row left and right, Entamoeba histolytica trophozoite, Blastocystis spp.; bottom row left and right, Endolimax nana cyst, Entamoeba histolytica/E. dispar trophozoite.
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