Gene expression of late Myosin heavy chain-2 (MYH2) and Myogenin (MYOG) muscle cell markers, normalized to three most stable reference genes, eEF1a, RPL13a and B2M, (Avg M value = 0.269). The 2−ΔΔCt algorithm was applied for relative quantification in differentiated myotubes. Differentiated myotubes were treated with 50 µM of DEXA or with 5μg GAE/mL (TPC) of ascorbic acid (Asc) and Rosso di Pitigliano (RED) extracts of plants grown in normal (RED-Ctr) or in drought stress conditions (RED-Ds), for 48 h. Data show relative expression to the untreated cells (control). * p < 0.05, ** p < 0.005 and *** p < 0.001 vs. control; § p < 0.05 vs. DEXA using one-way ANOVA.