XK and influenza: Using the immunoinformatic tools available to us at the time, we defined T cell epitopes that were present in the newly emergent strain (pH1N1 A/California/04/2009; GenBank accession numbers ACP41105 for hemagglutinin or HA and ACP41107 for the neuraminidase or NA), and highly conserved in the existing seasonal influenza vaccine (containing H1N1 A/Brisbane/59/2007; GenBank accession numbers ACA28844 for HA and ACA28847 for NA) [11].