Cleavage and Activation of the Severe Acute Respiratory Syndrome Coronavirus Spike Protein by Human Airway Trypsin-Like Protease حسب Bertram, S, Glowacka, I, Müller, M, Lavender, H, Gnirss, K, Nehlmeier, I, Niemeyer, D, He, Y, Simmons, G, Drosten, C, Soilleux, E, Jahn, O, Steffen, I, Pöhlmann, S