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Sequence alignment of NgaP and other unknown proteins and predicted secondary structure of NgaP. NgaP is aligned with other unknown proteins. Residues conserved in all of the proteins are shown in red. The alignment was carried out with ClustalW (31). The predicted secondary structural elements are indicated above the alignment. The putative (β/α)8-barrel region is shown in a blue box. The putative essential carboxylic amino acid residues (*) are indicated below the sequence.
