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Chromosome and seven circular plasmids of the Nostoc sp. N6 genome. The outermost and second circles indicate genes in forward and reverse orientation color-coded by their COG categories. The third circles show pseudogenes. The fourth circle of the chromosome shows the rRNA genes (brown) and tRNA genes (green). The two innermost circles show GC content in gray and black and the GC skew in green (+) and purple (–)
