Bashi, Z., زهراء, Jankeer, M. and منى 2008. Effectiveness of the enzyme cytosine deaminase in the free living ciliary organism Tetrahymena pyriformis (Ehrenberg, 1830). Journal of Education and Science (JES). 21, 3 (Sep. 2008), 15–27. DOI:https://doi.org/10.33899/edusj.2008.56042.