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Transcription activator which binds specifically to the MEF2 element present in the regulatory regions of many muscle-specific genes. Controls cardiac morphogenesis and myogenesis, and is also involved in vascular development. May also be involved in neurogenesis and in the development of cortical architecture . Isoform 3 and isoform 4, which lack the repressor domain, are more active than isoform 1 and isoform 2
