1 Department of Dermatology, University of California San Diego, San Diego, California, USA; Department of Cellular and Molecular Medicine, University of California San Diego, San Diego, California, USA; Stem Cell Program, University of California San Diego, San Diego, California, USA.
2 Department of Dermatology, University of California San Diego, San Diego, California, USA; Department of Cellular and Molecular Medicine, University of California San Diego, San Diego, California, USA; Stem Cell Program, University of California San Diego, San Diego, California, USA; Department of Dermatology, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea.
3 Department of Dermatology, University of California San Diego, San Diego, California, USA; Department of Cellular and Molecular Medicine, University of California San Diego, San Diego, California, USA; Stem Cell Program, University of California San Diego, San Diego, California, USA. Electronic address: gsen@ucsd.edu.