POTED and cystic fibrosis: Interestingly, in CF patients, there were several amino acid-related transporters that were under-represented after the Fl+Arg treatment such as branched-chain amino acid transport system permease protein (livH, livK, and livM), spermidine/putrescine transport system ATP-binding protein (potB, potC, potD, and potE), and l-cysteine transport system substrate-binding protein (tcyK, tcyM, and tcyN).