part of cytoplasm mitosome Wikipedia:Mitosome crypton GO:0032047 In Giardia species, mitosomes are sometimes present between the two nuclei. cellular_component A double-membrane-bounded organelle that functions in iron-sulfur protein maturation; evolutionarily derived from mitochondria. The mitosome has been detected only in anaerobic or microaerophilic organisms that do not have mitochondria, such as Entamoeba histolytica, Giardia intestinalis and several species of Microsporidia. These organisms are not capable of gaining energy from oxidative phosphorylation, which is normally performed by mitochondria. intracellular membrane-bounded organelle