Bromosporine is a broad spectrum bromodomain inhibitor (IC₅₀s = 0.41 µM, 0.29 µM, 0.122 µM and 0.017 µM for BRD2, BRD4, BRD9 and CECR2, respectively). At 1 µM, Bromosporine accelerates FRAP recovery of BRD4 and CREBBP, while displaying no activities against TIF1α, BAZ2A, and SMARCA2 even at 10 µM.