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Cysts of CDC:V621 featuring the unique morphology of a nearly round ectocyst and stellate endocyst with five to eight arms or rays at different planes (A, B). Pores are present at the junction points of the ecto‐ and endocysts. The pores are plugged with the operculum (arrows), which is removed at the time of excystation (arrowhead in C). Bar = 10 μm.
