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Transcription factor MafK is a bZip Maf transcription factor protein that in humans is encoded by the MAFK gene.

MafK is one of the small Maf proteins, which are basic region and basic leucine zipper (bZIP)-type transcription factors. The HUGO Gene Nomenclature Committee-approved gene name of MAFK is “v-maf avian musculoaponeurotic fibrosarcoma oncogene homolog K”.