RETRACTED: The NS1 gene of H5N1 influenza viruses circumvents the host anti-viral cytokine responses

This article has been retracted at the request of the Editor-in-Chief and Authors. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). Reason: This article duplicates parts of a paper by the same authors that has already been published in Nat. Med., 8 (2002) 950–954. The authors would like to apologize for this administrative error on their part.