. [ 31 ] For example, the influenza A genome contains 11 genes on eight pieces of RNA, encoding for 11 proteins : hemagglutinin (HA), neuraminidase (NA), nucleoprotein (NP), M1 , M2 , NS1 , NS2(NEP), PA, PB1, PB1-F2 and PB2. [ 32 ] Hemagglutinin (HA) and neuraminidase (NA) are the