viral protein influenzavirus M gene translation product M gene translation product (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1)) PR:000045385 Category=organism-gene. Requested by=IEDB. Requested by=ImmPort. Note: A single gene (M) has two entries in NCBIGene (GeneID) corresponding to the two splice variants, M1 and M2. The entries are NCBIGene:956527 (M1) and NCBIGene:956528 (M2). M (I34A1) An influenzavirus M gene translation product that is encoded in the genome of the H1N1 strain A/Puerto Rico/8/1934. protein matrix protein (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1))