The TNFSF9 Colorimetric Cell-Based ELISA provides a lysate-free, convenient, and high-throughput approach for sensitive detection of TNFSF9 protein expression profile in cells. The kit can be used for measuring the relative amounts of TNFSF9 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie siRNA or chemicals), or activators have on TNFSF9.