However, the expression of other cystine/cysteine transporters in specific tissues, such as SLC1A1 in neuron [33], SLC3A1 in breast cancer [34], or SLC7A9 in kidney [35], were downregulated or showed no difference between CRC tumors and non-tumor samples (Fig. S3F). The gene discussed is SLC1A1; the disease is neoplasm.