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Suspension of the parent strain (S. epidermidis O-47), the hemB mutant, and the plasmid-complemented mutant (colonies were picked from TSA after growth for 48 h at 37°C) in normal saline (0.9%). Tube 2 shows the clumping of the mutant even after vigorous shaking for several minutes. Tubes 1 and 3 show the parent strain and the plasmid-complemented mutant, respectively.
