But now we add CIS double bonds. So let's suppose we add a single CIS double bond into this molecule. How exactly will that determine or change the fluidity of the membrane? Well, in this particular case, we have a well defined structure. And because of this well defined structure, the adjacent hydrocarbon chains of these adjacent phospholipid molecules can actually interact very well and form many of these London dispersion forests. But in this particular case, because of the CIS double bond, we have a kink, we essentially have this bend in the chain.