Polyadenylation sites for influenza virus mRNA

Abstract
Polyadenylated transcripts of influenza virus RNA are incomplete copies of the individual genome segments, lacking sequences complementary to the 5''-terminal nucleotides of the virion RNA. By using a procedure which depends on the poly(A) tail of the mRNA being encoded in part by the genome, the common tract of uridine residues, .apprx. 17-22 nucleotides from the 5'' end of each segment, was determined to be the site of polyadenylation of influenza virus mRNA.