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Evolution of the short helix 18 in the region B of the 16S rRNA gene. A 12-nucleotide insertion differentiates rapid-growing mycobacteria from slow-growing mycobacteria, except for M. simiae complex that shows an ancestral-like short helix 18 sequence and M. terrae complex that possesses a 14-nucleotide insertion, instead of the typical 12-nucleotide insertion.
