"Expression from a luciferase reporter construct containing the 2 kb fragment of the promoter region of bcl-2-binding component 3 (PUMA) is enhanced by activation of the muscle regulatory transcription factor MyoD in both myoblasts and fibroblasts and diminishes by silencing of MyoD in myoblasts. E-Box Sequences at position - 857 of PUMA is the binding site for MyoD."xsd:string