... moststrongly expressed protea ses were Gzmb (granzyme B;only in C57Bl/6J at day 6 p.i.), Gzma (granzyme A),Tmprss4, Gzmc (granz yme C;onlyatdays1,3p.i.),Elane (neutrophil elastase)andCtrl (chymotrypsin-like;Table ... Activation of influenza A viruses bytrypsin treatment. Virology 1975, 68:426-439.6. Lazarowitz SG, Choppin PW: Enhancement of the infectivity of influenzaA and B viruses by proteolytic cleavage of ... catalytic activity to hydro lyze elas-tin which ensures elasticity of the lung tissue and pro-teolytic resistance. Under physiological conditions,organs are protected from this enzyme by endogenousinhibitors,...