At 80 days a total of 10,025 cells from three cloned CFTR−/− fetuses (AXH059, AXH115 and AXH116) were compared with a total of 10,411 cells from non-CF fetuses (AXH033 and triplets AXH066, AXH067, AXH068) (Table 1). This evidence concerns the gene CFTR and cystic fibrosis.