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. 1998 Jul 13;142(1):51–57. doi: 10.1083/jcb.142.1.51

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Conservation of amino acids in HA TMs. Transmembrane sequences from 36 HA proteins selected from all 14 influenza A subtypes and including three type B HAs were compared. For each position in the sequence of the TM, a conservation value was calculated by dividing the percentage of sequences having the most common amino acid by the number of different amino acids found at that position. For each position in the TM sequence, the conservation value and the most common amino acid are displayed. Left, amino terminus of the sequence. Amino acids that would reside in the outer leaflet of the membrane bilayer are more conserved than those predicted to reside within the inner leaflet.