Study of the underlying mechanisms and consequences of pathogenicity differences between two in vitro selected G1-H9N2 clones originating from a single isolate., Giang Thu, Nguyen, Rauw Fabienne, Steensels Mieke, Ingrao Fiona, Bonfante Francesco, Davidson Irit, and Lambrecht Bénédicte , Vet Res, 2019 Mar 01, Volume 50, Issue 1, (2019)