SLC3A2 and cancer: Theexpression levels for LAT1 and 4F2hc were at similar levels in humanbreast cancer (MCF-7) cells compared to HEK-hLAT1 cells.5 In addition, immunofluorescence staining demonstratedthe large differences in LAT1 expression between HEK-MOCK and HEK-hLAT1cell lines (Figure 1).