Comparative electrotransformation efficiency and spontaneous resistance to different antibiotics in M. chelonae strains ATCC 35752 and 9917, and M. abscessus ATCC 19977.

Transformation efficiencies upon selection with the indicated antibiotics on 7H11-OADC agar are expressed as numbers of drug-resistant CFUs per µg of DNA electroporated. The percentage below each transformation efficiency value represents the percentage of Kan, Zeo or Gen-resistant CFUs confirmed to be actual transformants either by PCR (pOMK-zeo) or determination of their XylE phenotype (all other plasmids).