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        High-Resolution Molecular Localization by Freeze-Fracture Replica Labeling

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        579
        The freeze-fracture technique splits the frozen lipid bilayer membrane into two halves and immobilizes membrane proteins and lipids by the vacuum evaporation of platinum and carbon. After a treatment by SDS to remove extramembrane materials, the specimen is subjected to immunogold labeling, which gives information on the two-dimensional distribution of membrane molecules and their relationship to various differentiated structures. In combination with rapid freezing, the freeze-fracture technique has an advantage over other methods using conventional chemical fixation because the distribution of lipids as well as proteins can be observed at the mesoscale in a wide area of the membrane.
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