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Variation in the ability of the wild-type (WT), hylB mutant (ΔhylB), and complemented (CΔhylB) strains of S. agalactiae to degrade hyaluronic acid. Degradation of the hyaluronic acid was detected as a clear zone (labeled areas) resulting from acetic acid precipitation of a complex of albumin and nondegraded hyaluronic acid. Assays were conducted at least twice.
