Word Count : 249

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Size exclusion chromatography (SEC), also known as gel filtration chromatography, is a technique used to separate molecules based on their size and shape. The method relies on porous materials, usually silica or agarose, as the stationary phase. These materials contain pores of a specific size that allow smaller molecules to enter and traverse the pores, while larger molecules are excluded and travel ______ __________ __________ ___ ________ ______.
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