EF633441   Influenza A virus (A/Leningrad/134/47/ts+18/1957(H2N2)) polymerase basic protein 1 (PB1) gene, complete cds.   [Influenza A virus (A/Leningrad/134/47/ts+18/1957(H2N2)) A/Leningrad/134/47/ts+18/1957 | 447527.8]