MyoR/ABF-1 is coded by the musculin (msc) gene and has been independently identified in mouse skeletal muscle precursors (MyoR for Myogenic Repressor [25]–[27], and in Hodgkin lymphomas and Epstein-Barr virus-transformed B-cell lines (ABF-1, Activated B cell Factor-1 [28]–[30]. The gene discussed is MSC; the disease is Hodgkins lymphoma.