1. Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA, USA.
2. Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA.
3. Center for the Neural Basis of Cognition, Carnegie Mellon University, Pittsburgh, PA, USA.
4. School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
5. Computational Biology Department, Carnegie Mellon University, Pittsburgh, PA, USA.