Alignment of the deduced amino acid sequences of ANT(4′). Sequences are from P. aeruginosa BM4492 [ANT(4′)-IIb], P. aeruginosa [ANT(4′)-IIa] (GenBank accession number M98270), Staphylococcus aureus [ANT(4′)-Ia] (GenBank accession number P05057), and Bacillus subtilis [ANT(4′)-Ib] (GenBank accession number P05057). Alignment was performed with the ClustalX program. Identical amino acids are indicated by an asterisk; conservative amino acid substitutions (indicated by dots) correspond to the following exchange groups: A, G, P, S, and T; H, K, and R; F, W, and Y; D, E, N, and Q; I, L, M, and V; and C.