A 7-year-old boy presents with a painless left scrotal mass. Imaging and biopsy confirm embryonal rhabdomyosarcoma (ERMS). Histology shows eosinophilic strap cells with cross-striations. The structure marked D in the diagram (myogenin/MyoD1 nuclear staining) is positive on immunohistochemistry. Which of the following best explains the diagnostic significance of this finding in confirming the myogenic origin of this tumor?

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