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NK cytotoxicity assay was analyzed by flow cytometry. One representative analysis is shown. The results of NK cytotoxicity assay are presented as histogram. Control = NK cells + K562 cells; Untreated = macrophages + NK cells + K562 cells; Treated = macrophages + NK cells + K562 cells + PA-MSHA. * = P<0.05, ns = non-significance.
