The most important trait for CF animal models is CFTR gene homology, so listing the animals most commonly used as CF models in this order, pigs have a homology percentage of 93% [61], while ferrets have 92% [62], sheep have 91% [63], mice have 78% [64], rats have 75.5% [65], and zebrafish have 55% [66]. This evidence concerns the gene CFTR and cystic fibrosis.