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Cytotoxicity of spreading/corroding and nonspreading/noncorroding variants of K. kingae. K. kingae strains KK01, KK03, and 269-492 were assayed for cytotoxicity for respiratory epithelial cells (A) and synovial and macrophage-like cells (B) by the LDH release assay. E. coli DH5α was used as a negative control.
