Anti-SLC7A1 polyclonal antibody is used to tag Solute carrier family 7 (cationic amino acid transporter, y+ system), member 1 for detection and quantitation by Western blotting and in plasma by immunohistochemical (IHC) techniques. It is used as a probe to determine the roles of solute carrier family 7 (cationic amino acid transporter, y+ system), member 1 in cationic amino acid uptake and retrovirus infection mechanisms and pathogenesis.