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The ACTC1 gene encodes an actin protein that is only expressed in cardiomyocytes (i.e. cardiac muscle cells). The schematic below shows the histone modifications that are present in the promoter region in cardiomyocytes vs fibroblasts (i.e. skin cells).
Use the information provided above to explain why the gene is actively expressed in cardiomyocytes but not fibroblasts. (2-3 sentences) (2 marks)
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