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To the Editor:We read with great interest the article ‘‘The importance of catio-nic amino acid transporter expression in human skin’’ by Schnorret al (J Invest Dermatol 120:1016^1022, 2003) and would like tomake some comments of interest.To date, four transport systems for cationic amino acids in ani-mal cells have been described and characterized (Deves and Boyd,1998).The functionally most important transport system is prob-ably the y