Patent ID: 8569016

Claim:
A complex comprising a polypeptide shown in (a1) or (a2) below and a polypeptide shown in (b1) or (b2) below: (a1) a PB1 polypeptide which consists of the amino acid sequence of SEQ ID NO: 2; or (a2) a PB1 polypeptide which consists of an amino acid sequence with at least 90% identity to the amino acid sequence of SEQ ID NO: 2 and which has binding activity to a fragment of influenza virus RNA polymerase PB2 subunit; and (b1) a PB2 polypeptide which consists of the amino acid sequence of SEQ ID NO: 4; or (b2) a PB2 polypeptide which consists of an amino acid sequence with at least 90% identity to the amino acid sequence of SEQ ID NO: 4 and which has binding activity to a fragment of influenza virus RNA polymerase PB1 subunit.