The Pax-5 Colorimetric Cell-Based ELISA Kit provides a lysate-free, convenient, and high-throughput approach for sensitive detection of Pax-5 protein expression profile in cells. The kit can be used for measuring the relative amounts of Pax-5 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie siRNA or chemicals), or activators have on Pax-5.