The Kimmel Center for Biology and Medicine of the Skirball Institute and Howard Hughes Medical Institute
New York University School of Medicine, New York, NY 10016 Center for Genomics and Systems Biology, Department of Biology; and Courant Institute of Mathematical Sciences, Computer Science Department, New York University, New York, NY10003 Center for Genomics and Systems Biology, Department of Biology; and Courant Institute of Mathematical Sciences, Computer Science Department, New York University, New York, NY10003.