The NOTCH4 co-activator complex, composed of NICD4 (NOTCH4 intracellular domain), RBPJ (CSL) and one of mastermind proteins, MAML1, MAML2 or MAML3, stimulates transcription from the HES5 gene promoter. The highest level of transcriptional activation of HES5 by NOTCH4 is seen when MAML2 is overexpressed, compared to the other two MAML proteins (Lin et al. 2002).
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