EnzymewasassayedaccordingtoBPSBRD3(BD2)AssayKit(Cat#32523)protocol.BRD3proteinisincubatedwithbiotinylatedacetylhistonepeptidesubstrate(Cat.#33000)inBRDassaybuffer(Cat.#33001)ina10µlreactionfor1houratRT.AlphaLISA®(R)GSHacceptorbeads(Perkinelmer)areadded,followedbyAlphascreen®(R)Streptavidin-conjugateddonorbeads(PerkinElmer).After1hourincubationatRT,Alphacountsaremeasured.