TMPRSS2 and ADAM17 cleave ACE2 differentially and only proteolysis by TMPRSS2 augments entry driven by the severe acute respiratory syndrome coronavirus spike protein - Heurich, A; Hofmann-Winkler, H; Gierer, S; Liepold, T; Jahn, O; Pöhlmann, S (J Virol, 2014)