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CD28nullCD137 + CD8- (clear bars) and CD28nullCD137 + CD8+ NKT-like cells (grey bars) producing granzyme B in 10 control subjects (N) and 14 patients with COPD (C). Data presented as box plots. There was a significant increase in CD28nullCD137 + CD8+ NKT-like cells producing granzyme B in patients with COPD compared with controls.
