CFTR and cystic fibrosis: In order to assess how frequent CFTR duplications overlapping the one found in our patient are reported in publicly available data, non-CF databases (including the Coriell Cell Line Copy Number Variants, DECIPHER, and the Database of Genomic Variants) were queried but did not reveal any similar intragenic duplications in the CFTR gene, other than 10 subjects with a CFTR intragenic duplication involving exon 10 previously reported as pertaining to a pseudogene or segmental duplication sequence24, 25, 26, 27, 28, 29, 30, 31.