The complete nucleotide sequence of the cloned full-length DNA copy of A/Kiev/59/79 (H1N1) influenza virus nucleoprotein gene has been determined. This strain is shown to be the natural recombinant that inherited its nucleoprotein gene from contemporary H3N2-influenza strains. The comparison with other NP-genes reveals the probable localization of antigenic determinants and phosphorylation site of the NP-protein.