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