Membrane proteins were resolved in two dimensions by a novel technique that uses discontinuous electrophoresis in both directions. After electrophoresis in the first direction in chloral hydrate, the membrane proteins were further resolved by a novel system that used organic-base dodecyl sulphates to stack and then resolve them. This latter system has several advantages over conventional electrophoresis in sodium dodecyl sulphate, notably that it avoids the production of artifacts generated by other systems.

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