HLA-DRB1 and swine influenza: Initially, we were interested in identifying 9-11mer epitopes from conserved proteins (M1, M2, NS1, PB1, PB2, PA and NP proteins) derived from the H1N1 influenza strain A/Puerto Rico/8/34 capable of binding to both HLA-A*02:01 and HLA-DRB1*01:01.