The Histone H4 Colorimetric Cell-Based ELISA Kit is a convenient, lysate-free, high throughput and sensitive assay kit that can detect HistoneH4 protein expression profile in cells. The kit can be used for measuring the relative amounts of HistoneH4 in cultured cells as well as screening for the effects that variuos treatments, inhibitors (ie siRNA or chemicals), or activators have on HistoneH4.