BRD4proteinisincubatedwithbiotinylatedacetyl-histonepeptidesubstrate(Cat.#33000)inBRDassaybuffer(Cat.#33001)ina10µlreactionfor1houratRT.AlphaLISA®®NickelChelateacceptorbeads(PerkinElmer)areadded,followedbyAlphascreen®®Streptavidin-conjugateddonorbeads(PerkinElmer).After1hourincubationatRT,Alphacountsaremeasured.