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Streptomyces coelicolor. (A) Image of an S. coelicolor colony with aerial mycelium and gray-pigmented spores. The dark halo around the colony and the droplets on top of the colony are secreted actinorhodin. (B) Schematic showing the actinorhodin biosynthetic gene cluster (SCO5071 to SCO5092) and its chemical structure.
