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Serratiochelin mutants grow poorly in human serum. The S. marcescens UMH9 wild type and Δcbs, Δsch, and Δcbs/sch mutants were cultured in 100% heat-inactivated human serum at 37°C with aeration. OD600 readings were taken every 15 min to measure bacterial growth. Data represent the means from three independent replicates.
