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Tryptic soy agar plates are made containing a diluted overnight culture of a reporter strain, the appropriate antibiotic to maintain the reporter, and X-GAL (5-bromo-4-chloro-3-indolyl-¦Â-d-galactopyranoside) as a reagent to detect ¦Â-galactosidase activity.Following incubation, the plates containing hla::lacZ will become intensely blue due to high hla expression and thus production of ¦Â-galactosidase enzyme, while plates with spa::lacZ will become very light blue.

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