LMNA and familial dilated cardiomyopathy: Leukocytes from both our lamin AC Ser431* patients showed the characteristic blebs, invaginations, and honeycomb images previously described in laminopathies, including DCM [12,13,14,15,16,17,18], even though both lamin AC Ser431* mutation carriers had not yet developed symptoms or echocardiographic evidence of DCM.