Differential use of importin-α isoforms governs cell tropism and host adaptation of influenza virus by Gabriel, G, Klingel, K, Otte, A, Thiele, S, Hudjetz, B, Arman-Kalcek, G, Sauter, M, Shmidt, T, Rother, F, Baumgarte, S, Keiner, B, Hartmann, E, Bader, M, Brownlee, G, Fodor, E, Klenk, H