Abstract
In this Letter we establish the structure of the ${L}_{{c}^{\ensuremath{'}}}$ phase exhibited by the lipid dipalmitoylphosphatidylcholine (DPPC) under hydration. On the basis of x-ray diffraction data on oriented multibilayers, we show that the structure of this phase is characterized by two lattices: a molecular superlattice and a hydrocarbon chain sublattice. Diffraction data available in the literature suggest the presence of similar molecular superlattices in the ${L}_{{c}^{\ensuremath{'}}}$ phase of various other lipid-water systems.
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