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Genomic organization of the cyanobacterial scytonemin operon. Gene nomenclature is based on the annotation of Nostoc punctiforme ATCC 29133. Core biosynthetic genes are shown in yellow. Regulatory genes are shown in blue. Genes shown in black or gray involve a region dedicated to monomer export, and genes shown in various shades of purple/pink code for dedicated aromatic amino acid biosynthetic (AAAB) genes that supply biosynthetic precursors.
