a ldl receptor promoter-chloramphenicol acetyltransferase ( cat ) fusion gene construct ( pldlr-cat 6500 ) was transfected into jeg-3 choriocarcinoma cells , and the transfected cells were cultured in the absence or presence of serum , ldl , or serum and 25-hydroxycholesterol .
C0086860
chloramphenicol
C0007634
cells