They form cysts and are then eaten by a small rodent.

It is an effective method to inactivate harmful protozoa that form cysts.

Parts of this tube may be obliterated, leaving small segments to form cysts.

When food is scarce, most species can form cysts, which may be carried aerially and introduce them to new environments.

There they form cysts that can persist for years.

It forms cysts with four nuclei which excyst in the body and become trophozoites.

These worms often form cysts in the wall of the intestine.

They have simple life cycles, and in many cases do not even form resting cysts.

These remaining ducts can form vaginal cysts later in life.

Almost all species form cysts, the stage involved in transmission (the exception is E. gingivalis).