Institute for Physiology, University of Bern, Bern, Switzerland; Pre-Synaptogenesis and Intracellular Transport in Hair Cells Group, Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany; Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany; Collaborative Research Center 889, University of Göttingen, Göttingen, Germany; Cognitive Hearing in Primates Group, Auditory Neuroscience and Optogenetics Laboratory, Deutsches Primatenzentrum GmbH, Göttingen, Germany; Auditory Neuroscience and Optogenetics Laboratory, Deutsches Primatenzentrum GmbH, Göttingen, Germany; and Multiscale Bioimaging Cluster of Excellence (MBExC), University of Göttingen, Göttingen, Germany.