When MM cell lines were treated with 100ng/ml FGF23, EGR1 mRNA was increased 2-10X at 1 hour and declined by 4 hours in RPMI-8226 and JJN3 (Figure 1A and 1C) and three additional MM cell lines (Supplementary Figure S2). The gene discussed is EGR1; the disease is Miyoshi myopathy.