Figure 1From: Nasal lavage natural killer cell function is suppressed in smokers after live attenuated influenza virusNasal Lavage Cells. NLF cells from nonsmokers at baseline were stained with hematoxylin and eosin. Squamous epithelial cells (black arrows) and neutrophils (dashed arrows) can be positively identified. n = 12. A representative image is shown. Bar = 10 μm.Back to article page