FCGR2B and chronic inflammatory demyelinating polyradiculoneuropathy: Pathomechanisms of CIDP include autoreactive T cells (Chi et al. 2010), impaired B cell maturation and reduced expression of regulatory Fc gamma receptor IIb (FcγRIIb, CD32b) on B cells and monocytes, promoting autoantibody production against peripheral nerve myelin and phagocytosis (Press et al. 2003; Tackenberg et al. 2009).