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Tetrahymena phagocytosis: Food vacuoles filled with India ink.
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Tetrahymena are one-celled freshwater organisms. Two species commonly used in research biology are Tetrahymena pyriformis, and Tetrahymena thermophila.
All Tetrahymena species share these characteristics:
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From: Leick, V. (1988). Gliding Tetrahymena thermophila: oriented chemokinesis in a ciliate. European journal of protistology, 23(4), 354-360.