passages.id: split_6_test_1314_passage
passages.type: progene_text
passages.text: The corresponding segment of the mouse apoB gene ( located - 40 to - 83 kb 5' of the structural gene ) exhibited a high degree of sequence conservation in the binding sites for the key transcriptional activators and also exhibited enhancer activity in transient transfection assays with CaCo-2 cells .