Amos Gilhar1, Aviad Keren2, Ralf Paus3. 1. Skin Research Laboratory, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel. Electronic address: doritg2000@gmail.com. 2. Skin Research Laboratory, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel. 3. Department of Dermatology & Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, FL, USA; Centre for Dermatology Research, University of Manchester and NIHR Manchester Biomedical Research Centre, Manchester, UK.