FCGRT and pemphigus: Lastly, FcRn has been implicated in the transport of autoantibodies into keratinocytes, thus contributing to the pathogenesis of pemphigus (Chen, Chernyavsky, Webber, Grando, & Wang, 2015; Roopenian & Akilesh, 2007; Stapleton, Einarsdóttir, Stemerding, & Vidarsson, 2015; Vidarsson et al., 2006).