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Colony size of the original ΔRv1009 strain (mc23126) compared with Erdman wild type and the effect on colony size of complementation with Rv1009 and with ksgA. Cultures were grown and transferred onto plates with Middlebrook 7H10 agar, and colonies were photographed at 23 days postinoculation as described in Materials and Methods. The strains in each panel are indicated. There were similar numbers of colonies on each plate.
