Phylogeny of acetyltransferases. To assess the robustness of the topology, 100 bootstrap experiments were performed on the sequences. GenBank accession numbers are as follows: acetyltransferases (AC) from Nocardioides sp. strain J54, W_028656429; Gordonia polyisoprenivorans, AFA71328; Salinispora tropica, ABP56629; and Actinomyces naeslundii, EJN83915; aminoglycoside 3-N-acetyltransferases from Gram-negative and -positive bacteria, AAC(3) type I, P23181; type II, P0A255; type III, P29808; type IV, P08988; type VI, AAA16194; type VII, P30180; type VIII, P29809; type IX, P29810; and type X, BAA78619. The scale bar represents a 20% amino acid sequence difference.