Microbial genome features 29%←G+ C content→68% Borrelia Deinococcus burgdorferi radiodurans single circular chromosome two circular Genome organization chromosomes+入 cIrcular chromosome plus one or more extrachromosomal large linear chromosome plus 21 extrachromosomal elements elements68% Deinococcus radiodurans Microbial Genome Features 29% G+C content Borrelia burgdorferi Genome organization single circular chromosome large linear chromosome plus 21 extrachromosomal elements circular chromosome plus one or more extrachromosomal elements two circular chromosomes