(a) Relative LDLR mRNA expression levels (*, P < 0.05, **, P < 0.01, ***, P < 0.001) in HEK293T cells by Control, LDLR-WT, Gly343Ser mutant (LDLR- c.1027G>A), and Ala627Thr mutant (LDLR- 1879G>A). (b, c) Based on the enzyme-linked immunosorbent assay (ELISA) standard curve, the expression of Control, LDLR-WT, Gly343Ser mutant (LDLR- c.1027G>A), and Ala627Thr mutant (LDLR- 1879G>A) in the supernatant of HEK293T cells was calculated and cell lysate. (*, P < 0.05, **, P < 0.01, ***, P < 0.001) (d) Western blotting was used to detect the expression of LDLR protein in HEK293T cells by Control, LDLR-WT, Gly343Ser mutant (LDLR- c.1027G>A), and Ala627Thr mutant (LDLR- 1879G>A), respectively.