![]() ![]() In this study, it was found that site A is a highly selective retinoic acid-responsive element (RARE) that responds preferentially to the recently identified retinoic acid receptor RXR alpha over the previously characterized retinoic acid receptors RAR alpha and RAR beta. ![]() Previous work in our laboratory has shown that hepatocyte-specific expression is determined by synergistic interactions between transcription factors bound to three separate sites, sites A (-214 to -192), B (-169 to -146), and C (-134 to -119), within a powerful liver-specific enhancer located in the region -222 to -110 nucleotides upstream of the apolipoprotein AI gene transcription start site (+1). The gene coding for apolipoprotein AI, a plasma protein involved in the transport of cholesterol and other lipids in the plasma, is expressed predominantly in liver and intestine.
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