RB-3, a PRC1 inhibitor, binds to RING1B-BMI1f , with a K d of 2.8 μM In Vitro RB-3 decreases the global level of H2A ubiquitination and induces differentiation in leukemia cell lines and primary acute myeloid leukemia (AML) samples. RB-3 inhibits H2A ubiquitination with an IC 50 of 1.6 μM. RB-3 inhibits PRC1 and disrupts the interaction with nucleosomes. RB-3 reduces colony formation in a mixed lineage leukemia (MLL)-eleven nineteen leukemia (ENL) model. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Western Blot AnalysisCell Line: TEX cells. Concentration: 6, 12, 25 μM. Incubation Time: 8d. Result: Dose-dependently increased C/EBPα-p42 protein levels. Form:Solid IC50& Target:Kd: 2.8 μM (RING1B-BMI1f)