The NF-?B p105/p50 Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can monitor NF-?B p105/p50 protein expression profile in cells. The kit can be used for measuring the relative amounts of NF-?B p105/p50 in cultured cells as well as screening for the effects that various treatments, inhibitors (ie. siRNA or chemicals), or activators have on NF-?B p105/p50.