Entamoeba invadens from turtles or snakes.  This section reveals the nucleus with the faint endosome near the center and chromatin clumps inside the nuclear membrane.  40,000x

E. invadens section through the nucleus, revealing unnamed granules.  This parasite of snakes and turtles can be grown in culture and remain active at room temperature, making them a nice and safe study subject, rather than using Entamoeba histolytica. 40,000x