CFTR, also known as cystic fibrosis transmembrane conductance regulator, is a protein in humans that regulates the transport of salt and water in and out of cells. There are several synonyms for CFTR, including ABCC7, ATP-binding cassette transporter sub-family C member 7, and epithelial chloride channel. Although they refer to the same protein, these synonyms can be helpful in different contexts. For example, scientists studying the genetics of cystic fibrosis may use the term ABCC7, whereas clinicians treating patients with the disease may use CFTR or the simpler term "chloride channel". Regardless of the term used, the function and importance of CFTR remain essential in maintaining healthy cellular physiology.