+Af9, or *Mllt3*, is a human [gene](/wiki/gene) encoding a protein that functions as a [transcription](/wiki/transcription) cofactor. It plays a key role in regulating gene expression and is often found rearranged in certain leukemias.
+## See also
+- [Protein](/wiki/protein)
+- [Chromosome](/wiki/chromosome)
+- [Leukemia](/wiki/leukemia)
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