Phylogenetic analysis of ArcA encoded in the arc gene cluster in L. hongkongensis. The tree was constructed by neighbor joining method using Kimura's correction and bootstrap values calculated from 1000 trees. Four hundred and nine and 409 amino acid positions in ArcA1 and ArcA2, respectively, were included in the analysis. The scale bars indicate the estimated number of substitutions per 10 amino acids. All names and accession numbers are given as cited in the GenBank database.