Figure 2: Decimative Cumulative Hamming Distances (ΣD) Between Paired Influenza A Subtype Hemagglutinins. Data are shown for (H1N1, H3N2) sequences pairs, (H1N1, H6N1) sequence pairs and (H3N3, H6N1) sequence pairs for decimative frame 100 (first codon position; left), decimative frame 010 (second codon position; center) and decimative frame 001 (third codon position; right).