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An amastigote is a protist cell that does not have visible external flagella or cilia. The term is used mainly to describe a certain phase in the life-cycle of trypanosomes. It is also called the leishmanial stage, since in Leishmania it is the form the parasite takes in the vertebrate host, but occurs in all trypanosome genera.
References
Amastigote Wikipedia(Text) CC BY-SA