The Cytochrome P450 3A7 Colorimetric Cell-Based ELISA is a convenient, lysate-free, high throughput and sensitive assay kit that can detect CytochromeP4503A7 protein expression profile in cells. The kit can be used for measuring the relative amounts of CytochromeP4503A7 in cultured cells as well as screening for the effects that variuos treatments, inhibitors (ie siRNA or chemicals), or activators have on CytochromeP4503A7.