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Mitochondria can join by fusion. Several protein ensembles that are involved in mitochondrial fusion have been characterized.
There is a mitochondrial outer membrane fusion machinery, composed by proteins of the Fzo1 family in yeast or by MFN1, MFN2 in mammals, and a mitochondrial inner membrane fusion machinery, with the Mgm1 protein in yeast or the equivalent OPA1 in mammals.
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