1 Bioengineering Department, Volgenau School of Engineering & Center for Neural Informatics, Krasnow Institutes for Advanced Study, George Mason University, Virginia 22030, USA.
2 Cold Spring Harbor Laboratory, Cold Spring Harbor 11724, USA. Electronic address: bhuo@cshl.edu.
3 Cold Spring Harbor Laboratory, Cold Spring Harbor 11724, USA. Electronic address: mitra@cshl.edu.