And what happens is there is a build up of pathogenic agents in those mucous membranes. Remember, the entire purpose of the mucous membranes in our lungs and other parts of our body is to trap pathogens and keep the pathogens from entering our body. But because of this thick layer of mucous membrane, as a result of cystic fibrosis, those bacterial ages and pathogens end up spending way too much time in the mucous membrane and that can basically create many different types of infections. So our body's inability to rid itself of the mucus membrane can increase the rate of infection and lead to many other respiratory and digestive problems. And finally, let's look at Tasax disease. Taste sac disease is another example of the human, of a human autosomal recessive disease.