PROBLEM TO BE SOLVED: To provide a gel for PAGE mainly composed of polyacrylamide, which exhibits high resolvability even for a high molecular weight substance and can provide an electrophoresis gel having excellent storage stability, mechanical strength and handleability. Provided. SOLUTION: A gel composition containing a (meth) acrylamide-based monomer and a specific cross-linking agent, a gel obtained from the same, and a precast gel comprising the gel. [Selection diagram] FIG. 4
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