passages.id: 1.0alpha7.train.345.sent
passages.type: sentence
passages.text: In the first, all four Hox/Exd heterodimers would bind to fkh[250con] in vivo, but the Abd-A/Exd heterodimer acts as a transcriptional repressor, whereas the other Hox/Exd heterodimers act as activators.  
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