MBD3 and dermatomyositis: The NuRD multiprotein complex includes the dermatomyositis-specific Mi2 autoantigen (Mi2-β), RB-associated proteins 46 and 48 (RbAp46 and RbAp48), MBD2 and MBD3, and metastasis-associated proteins 2 and 3 (MTA2 and MTA3) [9–11].