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CD28nullCD8- (clear bars) and CD28nullCD8+ NKT-like cells (grey bars) producing IFNγ in 10 control subjects (N) and 14 patients with COPD (C). Data presented as box plots. There was a trend for an increase in the percentage of CD28null/CD8+ NKT-like cells producing IFNγ in patients with COPD compared with control subjects.
