Three CF carriers had an intron 8 polypyrimidine 5 T CFTR allele, including 1 patient who was \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\Delta$$\end{document}ΔF508 heterozygous. Here, CFTR is linked to cystic fibrosis.