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The MEF2B gene encodes a transcriptional activator and is found mutated in ∼11% of diffuse large B cell lymphomas (DLBCLs) and ∼12% of follicular lymphomas. Here, we show that MEF2B directly activates the transcription of the proto-oncogene BCL6 in normal germinal-center B cells and is required for DLBCL proliferation. MEF2B mutations enhance MEF2B(More)
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