SLC1A1 and non-small cell lung carcinoma: Considering the EAAT3 and xCT transporters, their encoding genes (SLC1A1 and SLC7A11, respectively) were expressed at similar levels in NSCLC samples (Figure 5C), suggesting that cysteine enters the cell as a free amino acid and also as a dimer, cystine, because EAAT3 is a cysteine transporter and xCT is a glutamate/cystine antiporter [57].