SLC38A2 and breast carcinoma: Further analysis of RNA-seq data of four breast cancer cell lines with different receptor phenotypes (MCF-7, SKBR3, MDA-MB-231, and MDA-MB-468) demonstrated that, in addition to the full-length SNAT2 transcript (isoform 1), there were truncated splice variants of SNAT2 (isoforms 2 and 3) encoding shorter proteins lacking three and six transmembrane domains (SI Appendix, Fig. S1C).