The activities of sCPG as an xCT inhibitor and of esomeprazole as a blocker of proton extrusion were tested on the following tumor cell lines: a murine sarcoma cell line, MCA obtained from a 3-MCA tumor [14], the commercial murine melanoma cell line B16-F10 (from here: B16), and the human melanoma MePa cells, obtained from a human melanoma metastasis [40]. Here, SLC7A11 is linked to melanoma.