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