Viruses 2014, 6, 3683-3698; doi:10.3390/v6093683 viruses ISSN 1999-4915 www.mdpi.com/journal/viruses Article IFITM Proteins Inhibit Entry Driven by the MERS-Coronavirus Spike Protein: Evidence for Cholesterol-Independent Mechanisms Florian Wrensch, Michael Winkler and Stefan Pöhlmann * Infection Biology Unit, German Primate Center, 37077 Göttingen, Germany; E-Mails: