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Figure 1 Pedigree drawings of dilated cardiomyopathy (DCM) families affected by cardiac troponin C and T mutations. All individuals had normal left ventricular wall thickness by echocardiography, and no patients had atrioventricluar block or impaired skeletal muscle function. Squares = male family members; circles = female family members; symbols with slash = deceased individuals; open symbols = unaffected individuals; solid symbols = individuals affected by DCM; half-solid symbols = individual with left ventricle enlargement; checkered symbols = individuals who died suddenly; question marks = unknown clinical status; plus signs = presence of mutation; minus signs = absence of mutation.