Acknowledgements
We thank Silke Gotschy, Martina Hitzenbichler, and Sabine Mühlsimer for their excellent technical assistance as well as Jessica Plewa, Michael Becker, and Axel Unverzagt for assistance with human body donors. All PV samples were received from patients who had given written informed consent. A positive ethics vote was given for: PV1, University clinic Lübeck (Az 12-178), PV2 University Clinic Budapest (249-12), PV3 University Clinic Gießen/Marburg (Studie 20/14). All patients suffered from PV with mucocutaneous involvement. The study was supported by DFG FOR 2497 to JW and AY and in part by structural funds of the Excellence Cluster Precision Medicine in Chronic Inflammation (EXC 2167) from the Deutsche Forschungsgemeinschaft to ES.