where can the gene linked to cystic fibrosis be found
Cystic fibrosis CF is inherited in an autosomal recessive manner.[1] It is caused by the presence of mutations in both copies of the gene for the cystic fibrosis transmembrane conductance regulator (CFTR) protein.[1] Those with a single working copy are carriers and otherwise mostly normal.[3] CFTR is involved in production of sweat, digestive fluids, and mucus.[6] When CFTR is not functional, secretions which are usually thin instead become thick.[7] The condition is diagnosed by a sweat test and genetic testing.[1] Screening of infants at birth takes place in some areas of the world.[1]
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Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
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