Assertion: mitochondrion's membrane | /r/CapableOf | differ in composition
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text: Because both organelles are surrounded by inner and outer membranes that differ in composition, their division machines must accomplish the synchronized constriction of both membranes, the subsequent fusion of the four lipid bilayers, the final separation of the two daughter organelles, and possibly the resolution of the fused membranes back into two discrete bilayers (11, 12) (Fig. 1).