This complex includes dermatomyositis-specific autoantigen Mi2 (Mi2-β), retinoblastoma-binding protein 46 and 48 (RbAp46 and RbAp48), methyl-CpG-binding domain protein 2 and 3 (MBD2 and MBD3), and metastasis-associated 1 family member 2 and 3 (MTA2 and MTA3), whose knockout is critical for L1 repression [269,295,296,297]. Here, MTA2 is linked to dermatomyositis.