We need an antagonist that will specifically bind and block transport activity of the cationic amino acid transporter ATRC1 (y+ class). Please contact me by email at the following address krishnakumar at utmem1.utmem.edu or mail to: Krish Kizhatil 601 MSB, 858 Madison Avenue, Memphis TN 38163, USA. FAX # 901-448-8462. THANKS! KRISH.