So we see that saturated fatty acids create a well structured arrangement of hydrocarbon chains. And these straight chain hydrocarbons can form stronger and more extensive intermolecular bonds with the nearby fatty acids. And this favors rigidity. It basically decreases fluidity and it raises the melting temperature. Now, a cyst double bond like the one shown here. So in systems that are unsaturated and contain a cyst double bond, we see that that bond creates a kink, a bend in that structure, and this interferes with the well defined structure of that membrane.