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Proton and deuterium order parametersmeasured for the liquid crystalline phase of unsonicated lipid bilayer membranes are interpreted in terms of two motions:(i) chain reorientation and (ii) chain isomerization via kink diffusion. The observed order parameters are found to be compatible with angular deflections of the chain of about 50 with respect to the bilayer normal, coupled with a probability of trans orientation of a methylene segment in the upper part of the chain of about 0.8-0.9. The motional model can beshown to account for the dynamic properties of the membrane system as mea-