The PKA-R2beta Colorimetric Cell-Based ELISA Kit provides a lysate-free, convenient, and high-throughput approach for sensitive detection of PKA-R2beta protein expression profile in cells. The kit can be used for measuring the relative amounts of PKA-R2beta in cultured cells as well as screening for the effects that various treatments, inhibitors (ie siRNA or chemicals), or activators have on PKA-R2beta.