Ikerbasque, Basque Foundation for Science, Bilbao 48013, Spain.|Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.|Laboratory for Optical and Computational Instrumentation, University of Wisconsin, Madison, WI 53706, USA.|Laboratory for Optical and Computational Instrumentation, University of Wisconsin, Madison, WI 53706, USA.|Laboratory for Optical and Computational Instrumentation, University of Wisconsin, Madison, WI 53706, USA.|Howard Hughes Medical Institute, Janelia Research Campus, Ashburn, VA 20147, USA.|Neuroscience Institute and Computer Science Department, Princeton University, NJ 08544, USA.