1. Genentech, South San Francisco, CA 94080, USA.
2. Department of Cellular and Molecular Medicine, Institute for Genomic Medicine, Stem Cell Program, University of California at San Diego, Sanford Consortium for Regenerative Medicine, 2880 Torrey Pines Scenic Drive, La Jolla, CA 92037, USA.
3. Rosalind Russell/Ephraim P. Engleman Rheumatology Research Center, University of California, San Francisco, CA 94143, USA.
4. Department of Physiology, National University of Singapore, Singapore.
5. Genome Institute of Singapore and Molecular Engineering Laboratory, Agency for Science, Technology and Research, Singapore.