CXCR3(+)/IFN(+) cytotoxic T-cell type 1 (Tc1) cell accumulation in the bronchoalveolar lavage (BAL) in hypersensitivity pneumonitis is mediated by IFN-γ, which facilitates the expression and secretion of CXCL10, which induces lymphocyte chemotaxis and alveolitis sustenance, according to Agostini et al. [22]. The gene discussed is IFNG; the disease is hypersensitivity pneumonitis.