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The complete structure of the neuraminidase gene from the A/RI/5-/57 strain of influenza virus has been determined. It is 1467 nucleotides long and codes for a protein of 469 amino acid residues. Comparison with the gene sequence for the N1 strains A/WSN/33 and A/PR/8/34, the N2 strain A/Udorn/72 and the protein sequence for the N2 strain A/Tokyo/3/67 shows the amino acid sequence changes that have occurred during antigenic shift (60%) and drift (7-9%).

Neuraminidase gene from the early Asian strain of human influenza virus, A/RI/5-157 (H2N2)