UM729 is a new pyrimidoindole, which has an additive effect with AhR antagonists in preventing differentiation in most AML specimens; collaborates with Ahr suppressors in preventing AML cell differentiation. IC50 value: Target: SR1 and UM729 can be implemented as a standardized supplement in culture media and will pave the way for studies of self-renewal mechanisms and for the identification of new antileukemic drugs through cell-based assays for primary human AML cells.

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