Like many other ancient genes. the cystic fibrosis transmembrane conductance regulator (CFTR) has survived for hundreds of millions of years. In this report. we consider whether such prodigious longevity of an individual gene--as opposed to an entire genome or species--should be considered surprising in the face of eons of relentless DNA replication errors. https://herbsdailyes.shop/product-category/dental-chewing-gums/