passages.id: split_6_test_2665_passage
passages.type: progene_text
passages.text: Surrounding the transcription initiation sites are motifs characteristic of non - TATA , non - CAAT , GC - rich promoters , including consensus Sp1 / GC boxes , an initiator element , cAMP - responsive element - binding protein ( CREB ) sites , and clusters of other putative transcription factor sites within a genomic CpG island .