Compatibility among Polymerase Subunit Proteins Is a Restricting Factor in Reassortment between Equine H7N7 and Human H3N2 Influenza Viruses

Chengjun Li, Masato Hatta, Shinji Watanabe, Gabriele Neumann and Yoshihiro Kawaoka

Journal of Virology 82 ( 23 ): 11880 - 11888 , 2008