The CSFR (Phospho-Tyr723) Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can monitor CSFR (Phospho-Tyr723) protein expression profile in cells. The kit can be used for measuring the relative amounts of CSFR (Phospho-Tyr723) in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on CSFR (Phospho-Tyr723).