BMI1(B lymphoma Mo-MLV insertion region 1 homolog)、PCGF4(polycomb group RING finger protein 4)またはRNF51(RING finger protein 51)は、ヒトではBMI1遺伝子によってコードされているタンパク質である。BMI1はRINGフィンガーを有するポリコーム群タンパク質であり、BMI1はがん原遺伝子である。
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