SUPPLEMENTARY FIGURE A14-4 Phylogenetic relationships scaled to time for each gene segment (PB2, PB1, PA, HA, NP, NA, M & NS) of the swine-origin influenza A (H1N1) virus as represented in Figure A14-2 of the main text but with full virus names and GenBank accession numbers. Internal nodes are reconstructed common ancestors with 95% credible intervals on their date given by the grey bars. Human viruses are coloured blue, swine viruses in red and avian viruses in green. Newly described Hong Kong sequences have bold labels. Sw/HK/915/04 (H1N2) is highlighted with an arrow when present (see main text). Timeline is in years.