Myoblast Fusion (IMAGE) NIH/National Human Genome Research Institute Caption The graphic depicts normal myoblasts (early muscle cells with a single nucleus) fusing together to form muscle cells with more than one nucleus. The cascade is disrupted in Carey-Fineman-Ziter syndrome, because of a defect in the membrane protein, myomaker, which is required for cell-cell fusion Credit Darryl Leja, NHGRI Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.