tokens: 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 .
folded_tokens: mutation of ttf-1 binding site ( tbe ) 1 , 3 , and 4 in combination markedly decrease transcriptional activity of sp-a promoter-chloramphenicol acetyltransferase construct contain sp-a gene sequence from -256 to +45 .