IFNG and sarcoidosis: Exhaled breath condensate (EBC) offers a non-invasive approach to sampling the fluid lining the respiratory tract and (Kazani and Israel 2012) our group has detected significantly elevated markers of macrophage activity (i.e. TNF-α, TGF-β1 and neopterin) (Ahmadzai et al. 2013) and IFNγ (Huang et al. 2013) in sarcoidosis EBC compared to healthy control subjects.