CP-A cells are derived from non-dysplastic BO and do not exhibit strong tumourigenic properties (Lin et al., 2012) so we compared KLF5 expression in BO-derived CP-A and OAC-derived OE19 cells and found that KLF5 is expressed at similar levels in (Figure 4—figure supplement 1A). The gene discussed is CPA1; the disease is bronchiolitis obliterans syndrome.