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c-Maf is part of the Maf family of transcription factors that possess a conserved basic region and a leucine zipper domain that mediate DNA and protein-protein binding and plays an important role in tissue-specific gene regulation and cell differentiation. c-Maf is a transcriptional activator of interleukin 4 and 10 in T-cells, and is involved in lens fiber cell differentiation. c-Maf translocation has been observed in human multiple myeloma and may be oncogenic.