1. Computer Science and Artificial Intelligence Laboratory (CSAIL), Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
2. Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA;
3. Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts 02139, USA
4. Program in Computational and Systems Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
5. Department of Chemistry, Institute for Medical Engineering & Science (IMES), and Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
6. Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA