SLC7A2 and gastritis: We have demonstrated that cationic amino acid transporter 2 (CAT2) expression is upregulated in macrophages in vitro, and in mouse and human gastritis tissues, with co-localization to gastric macrophages by immunostaining; we also identified CAT2 as the protein responsible for the uptake of l-arginine (L-Arg) into macrophages [4].