>tr|M1S4A4|M1S4A4_9INFA Protein PB1-F2 OS=Influenza A virus GN=PB1-F2 MEREQDTPWTQSTEHINIQKRGNGQQTQKLEHPNLTQLMDHYLRIMSQVDMHKQTVSWKQ WLSLKSPTQESLKTRVLKRWKLFNKQEWTS