Amoeba have one, Dictyostelium discoideum, Paramecium aurelia and Chlamydomonas reinhardtii have two, and giant amoeba, such as Chaos carolinensis, have many.
Amoeba ten un, Dictyostelium discoideum, Paramecium aurelia e Chlamydomonas reinhardtii teñen dous, unha ameba xigante, como Chaos carolinensis, ten moitos.