Tetrahymena

Tetrahymena, a unicellular eukaryote, is a genus of free-living ciliates. The genus Tetrahymena is the most widely studied member of its phylum.:59 It can produce, store and react with different types of hormones. Tetrahymena cells can recognize both related and hostile cells.

Tetrahymena
Tetrahymena thermophila
Scientific classification
Domain: Eukaryota
Clade: Diaphoretickes
Clade: SAR
Clade: Alveolata
Phylum: Ciliophora
Class: Oligohymenophorea
Order: Hymenostomatida
Family: Tetrahymenidae
Genus: Tetrahymena

They can also switch from commensalistic to pathogenic modes of survival. They are common in freshwater lakes, ponds, and streams.:277

Tetrahymena species used as model organisms in biomedical research are T. thermophila and T. pyriformis.

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