passages.id: split_6_test_643_passage
passages.type: progene_text
passages.text: Deletion mapping of the human presenilin-1 ( PS1 ) promoter delineated the most active fragment from - 118 to + 178 in relation to the transcription start site mapped in this study , in both human neuroblastoma SK-N-SH and hepatoma HepG2 cells .