The IL-2Rβ Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect IL-2Rβ protein expression profile in cells. The kit can be used for measuring the relative amounts of IL-2Rβ in cultured cells as well as screening for the effects that variuos treatments, inhibitors (ie siRNA or chemicals), or activators have on IL-2Rβ.