>sp|P05780-1|M2_I33A0 Isoform M2 of Matrix protein 2 OS=Influenza A virus (strain A/Wilson-Smith/1933 H1N1) OX=381518 GN=M MSLLTEVETPIRNEWGCRCNDSSDPLVIAANIIGILHLILWILDRLFFKCIYRRFKYGLK RGPSTEGVPESMREEYRKEQQNAVDVDDGHFVNIELE