Variable deletion of exon 9 coding sequences in cystic fibrosis transmembrane conductance regulator gene mRNA transcripts in normal bronchial epithelium - Chu, CS; Trapnell, BC; Murtagh, JJ; Moss, J; Dalemans, W; Jallat, S; Mercenier, A; Pavirani, A; Lecocq, JP; Cutting, GR; Guggino, WB; Crystal, RG (EMBO J, 1991)