SLC38A1 mRNA levels were detected following silencing of β-catenin in HepG2 A. and Hep293TT B. cell lines by qRT-PCR. Data are presented as mean ± SEM. *** P < 0.001, ns, not significant. No changes in SLC38A1 protein levels were detected in HepG2 C. and Hep293TT D. cell lines following silencing of β-catenin, as revealed by Western blotting.