Different factors affect the production of phagocytes in tetrahymena species.This includes stimulations from the environment that causes the organism to produce vacuoles that are used to injest microbes. Experiments can also stimulate or hinder production of vacuoles in tetrahymena. For example, serotonin and calcium can stimulate production of vacuoles. The production of vacuoles is concentration dependent of these stimulants. However production may be inhibited by other stimulants such as high temperatures as well as taxol.
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