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Four overlapping peptides covering the extracellular domain of M2 protein of influenza A virus. AA: amino acid residue; TMR: transmembrane region. P1: N-KSLLTEVETPIRNEWGCRCNDSSD; P2: KSLLTEVETPIR-G-SLLTEVETPIR (two repeats of P′2); P3: KETPIRNEWGCR-G-ETPIRNEWGCR (two repeats of P′3); P4: KNEWGCRCNDSSD-G-NEWGCRCNDSSD (two repeats of P′4).
