ASAH1 and pulmonary fibrosis: Our analysis identified several additional genes with both strain-specific expression patterns and reported roles in pulmonary fibrosis or immune function, including Cysltr2 (B6 > AJ > C3H) (Beller et al., 2004), Asah1/Asah2 (B6 > AJ = C3H) (Dhami, He & Schuchman, 2010), Hck (B6 > C3H > AJ) (Ernst et al., 2002), Gas5 (B6 > AJ = C3H) (Song et al., 2014), and Cpa3 and Mcpt4 (C3H = AJ > B6) (Paun & Haston, 2012).