The p70 S6 Kinase β Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect p70S6Kinaseβ protein expression profile in cells. The kit can be used for measuring the relative amounts of p70S6Kinaseβ in cultured cells as well as screening for the effects that variuos treatments, inhibitors (ie siRNA or chemicals), or activators have on p70S6Kinaseβ.