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Circular chromosome of S. tropica CNB-440, oriented to the dnaA gene. The outside outer ring shows the locations of secondary metabolic gene clusters. The inside outer ring shows the locations of putative mobile genetic elements. The center ring shows a normalized plot of GC content (maximum, 75.5%; minimum, 60.3%; average, 69.5%). The inner ring shows a normalized plot of GC skew (maximum, 0.2346; minimum, −0.2504; average, −0.0020).
