Single nucleotide polymorphisms identified in pH1N1 and H1N2 following 10 passages in ST cells as compared to genome sequences prior to cell passaging^a.

<p>For non-synonymous mutations, amino acid changes are shown in parentheses.</p>a<p>For reassortant viruses R1 and R2, single nucleotide polymorphisms are reported based on changes observed from the parent segment at x+0.