passages.id: split_5_test_829_passage
passages.type: progene_text
passages.text: Mutation of TTF-1 - binding sites ( TBE ) 1 , 3 , and 4 in combination markedly decreased transcriptional activity of SP-A promoter - chloramphenicol acetyltransferase constructs containing SP-A gene sequences from - 256 to + 45 .