tokens: Gel shift assays and site-directed mutagenesis studies defined essential GATA and Ets binding motifs 93 and 150 nucleotides upstream of the transcription start site , a finding which further substantiates these elements as important determinants of megakaryocytic gene expression .
folded_tokens: gel shift assays and site-directed mutagenesis studies defined essential gata and ets binding motifs 93 and 150 nucleotides upstream of the transcription start site , a finding which further substantiates these elements as important determinants of megakaryocytic gene expression .
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