passages.id: split_5_test_128_passage
passages.type: progene_text
passages.text: Analyzed DNA sequences included delta and beta 5' flanking regions extending from approximately - 500 to + 50bp ( promoter regions ) , truncated delta and beta 5' flanking regions extending from approximately - 250 to + 50 bp , and chimeric promoter constructions , which consisted of a distal delta or beta fragment fused to a proximal beta or delta sequence .