DLK1 and hyperinsulinemic hypoglycemia, familial, 4: Although we demonstrated the potency of the Dlk1-Dio3 locus derived miRNAs (miR-411 and miR-540-3p) to induce myotube hypertrophy using an in vitro model, muscular hypertrophy phenotype observed in the callipyge mutation and myostatin deficiency would be caused by slightly different mechanism.