However, and as a note of caution, a direct comparison of two key genes in the FGFR2b signature in humans in the donor (n = 4) and IPF (n = 4) CD274pos populations isolated for this study from our biobank revealed that IPF CD274pos cells expressed lower levels of FGFR2b and ETV5, compared with the corresponding expression in donor CD274pos cells (Figure S2); this suggests important heterogeneity in terms of FGFR2b signaling activation in IPF vs. donor CD274pos cells between different datasets. The gene discussed is ETV5; the disease is idiopathic pulmonary fibrosis.