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Schematic representation of the HA expression vector pWRG1638. The plasmid was constructed from pWRG7054, a mammalian expression vector containing the CMVie transcriptional enhancer, promoter and intron A regulatory elements and the poly(A) signal of the bovine growth hormone (bGH) in a pUC19 backbone, and a full-length cDNA encoding the HA gene from Sw/IN (H1N1).
