The FOXK1 Colorimetric Cell-Based ELISA is a convenient, lysate-free, high throughput and sensitive assay kit that can detect FOXK1 protein expression profile in cells. The kit can be used for measuring the relative amounts of FOXK1 in cultured cells as well as screening for the effects that variuos treatments, inhibitors (ie siRNA or chemicals), or activators have on FOXK1.