Cardiolipin induces structural change, shows a great variety of forms of aggregates and has a  close connection with membrane fusion which is when two organic bilayers merge.
Because of cardiolipin's unique structure, a change in pH and the presence of divalent cations can induce a structural change. CL shows a great variety of forms of aggregates. And it is believed to have a close connection with membrane fusion. In membrane biology, fusion is the process by which two initially distinct lipid bilayers merge their hydrophobic cores, resulting in one interconnected structure. 
