Viruses were grown in embryonated hen eggs and the viral RNA was extracted from allantoic fluid. The partial PB1 polymerase gene fragments were amplified by RT-PCR,and the purified PCR products were sequenced using the CEQ sequence kit by direct method.是什么意思_Viruses were grown in embryonated hen eggs and the viral RNA was extracted from allantoic fluid. The partial PB1 polymerase gene fragments were amplified by RT-PCR,and the purified PCR products were sequenced using the CEQ sequence kit by direct method.在線翻譯_英語_讀音_用法_例句