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<p>normally CREB interaction with CRE and the subsequent translation of the BDNF transcript is blocked by of the <a href="page.php?w=basic_helix-loop-helix">basic helix-loop-helix</a> transcription factor protein 2 (<a href="page.php?w=BHLHB2">BHLHB2</a>).  NMDA receptor activation triggers the release of the regulatory inhibitor, allowing for BDNF exon IV upregulation to take place in response to the activity-initiated calcium influx. Activation of <a href="page.php?w=Dopamine_receptor_D5">dopamine receptor D<sub>5</sub></a> also promotes expression</p><p>
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