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Genomic content near S4 and the α-operon. Shown are a representative sample of the genomes. A) Consensus genome context of the S4 gene in the α-operon across most bacterial groups. B & C) Context of the α-operon and S4, respectively, in bacterial groups where an S4 gene is located outside the α-operon. Phyla abbreviations are given in parentheses. The lengths of the genes are to scale and gene are color-coded according to COG (clusters of orthologous groups) functional categories.
