CFTR and cystic fibrosis: PCA was conducted on BAL flow cytometry data from children with CF not on modulator therapy (CF.U, n=30); children with CF on CFTR modulator therapy LUM/IVA (CF.LUM/IVA, n=6) or IVA (CF.IVA, n=2) and age-matched controls (non-CF, n=8) (figure 2B).