Anomalous diffusion of phospholipids and cholesterols in a lipid bilayer   and its origins
  Combining extensive molecular dynamics simulations of lipid bilayer systems of varying chemical composition with single-trajectory analyses we systematically elucidate the stochastic nature of the lipid motion. We observe subdiffusion over more than four orders of magnitude in time, clearly stretching into the sub-microsecond domain. The lipid motion delicately depends on the lipid chemistry, the lipid phase, and especially on the presence of cholesterol. We demonstrate that fractional Langevin equation motion universally describes the lipid motion in all phases including the gel phase, and in the presence of cholesterol. The results underline the relevance of anomalous diffusion in lipid bilayers and the strong effects of the membrane composition. 
Jae-Hyung Jeon, Hector Martinez-Seara Monne, Matti Javanainen, and   Ralf Metzler
cond-mat.soft physics.bio-ph q-bio.SC