We have this system in which we have four adjacent phospholipid molecules in which we don't have any double bonds. And such a system is said to be a saturated system. Now, let's suppose we compare this to this case in which we have these for phospholipids that have the same exact length. 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?