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The type A and Type B articles don't say what the essential differences between them are.
Both say they have 8 RNA strands. (A says 13,588 bases, B says 14,648 nucleotides (=bases) ie B is somewhat larger). A says they code for eleven proteins (HA, NA, NP, M1, M2, NS1, NEP, PA, PB1, PB1-F2, PB2). but no similar statement for B (although B still seems to have HA and NA and many of the others). Presumably the HA and NA of B are very different from all the HA and NA subtypes of A but how ? Rod57 (talk) 16:52, 7 October 2010 (UTC)