Figure 1. Neighbor-joining tree of a 1,341-bp region of unique 16S rRNA gene sequences of 138 clinical isolates and reference strains of the Mycobacterium chelonae-abscessus complex. Branch support is recorded at nodes as a percentage of 1,000 bootstrap iterations. Clinical isolates are labeled by the identification, followed by the sequevar group and the number of isolates. Scale bar indicates nucleotide substitutions per site. CIP, Collection of Institute Pasteur; CCUG, Culture Collection, University of Göteborg, Sweden; CV, M. chelonae variant; ATCC, American Type Culture Collection.