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: nuclear export protein), PA, PB1 (polymerase basic 1), PB1-F2 and PB2. [ 52 ] Hemagglutinin (HA) and neuraminidase (NA)