1. Department of Electrical and Computer Engineering, University of California Santa Cruz, Santa Cruz, California 95060, USA
2. Department of Applied Mathematics and Statistics, University of California Santa Cruz, Santa Cruz, California 95060, USA
3. Department of Biology and Center for Regenerative and Developmental Biology, Tufts University, Medford, Massachusetts 02155, USA
4. Genomics Institute, University of California Santa Cruz, Santa Cruz, California 95060, USA
5. Institute for the Biology of Stem Cells, University of California Santa Cruz, Santa Cruz, California 95060, USA