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Differences between the amino acid sequences of the P1 proteins of subtypes 1 (ST1) and 2 (ST2) and variants 1 (V1) and 2 (V2) of M. pneumoniae in the investigated 401-bp part of the repetitive element repMp2/3. Amino acid positions of the P1 proteins are indicated according to the published sequences (4, 8, 12, 23). The sequence of the new variant was characterized as V2b.
