Since the CG-based models are inadequate to differentiate between the membranes with unsaturated and cyclopropane ring containing lipids, we simulate three membranes (NM, MMS, and MMU) under all-atom (AA) resolution. The results obtained from AA-simulations are depicted in Figure . Figures display the temperature dependence of average area per lipid <AL> and average membrane thickness <TL>. Figures show average deuterium order parameter <SCD> for different categories of acyl chains (cyclopropane ring-, monounsaturated chain-, and saturated chain-containing). The above results indicate that the NM membrane shows the least change of the packing density on cooling, while the MMS membrane exhibits a sharp change between 310 and 330K due to the fluid-to-gel phase transition. However, all the changes are less dramatic compared to that in CG-resolution, which indicates a partial gel formation of the MMS membrane. More interestingly, a clear difference in the packing densities between the NM and MMU membranes is now vivid. The MMU membrane undergoes relatively sharp transition between 290 and 270 K. The structural parameters portray some ordering in MMU bilayer compared to NM and the difference is more visible below 290 K. However, the dynamics of the lipid membrane is less impacted by replacing the cyclopropane rings with C-C single bond or C=C double bond. The lateral diffusion coefficient (Dxy) values for the NM and MMU practically merge with each other, while the MMS is twice less diffusive. Unlike the diffusion coefficient, the short time membrane fluidity which can be denoted by the rotational auto-correlation function (RCF) (Figures ) is bit more impacted under the above conditions. The RCF decay slows down with cooling. While at 350 K the correlations decay at the same rate for all three membranes, at the lower temperatures (<270 K) the order of slowing down of RCF decay is MMS > MMU > NM.