tokens: The intron 8 enhancer region was not activated by GATA-1 together with Sp1 in transactivation experiments in COS-1 cells indicating the involvement of a related Sp1 protein or of another unidentified erythroid factor .
folded_tokens: the intron 8 enhancer region be not activate by gata-1 together with sp1 in transactivation experiment in cos-1 cell indicate the involvement of a related sp1 protein or of another unidentified erythroid factor .