Word Count : 225

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Gels used in chromatography are three-dimensional, cross-linked polymeric networks capable of holding large amounts of solvent without dissolving. One of their most important properties is porosity, which determines the size of molecules that can penetrate the gel. This property allows gels to act as molecular sieves, separating substances based on their molecular size, as seen in ____ _______ ________ ________ __________ _________ ___ ______.
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