A supporting matrix used for sample application during electrophoresis. Gels are most commonly composed of starch, cellulose acetate, polyacrylamide or agarose.

• 胶在电泳的时候用来支持样本操作的基质。凝胶通常组成物为淀粉，纤维二醋酸酯，合成凝胶或洋菜胶。