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A three-generation family tree of family B is shown. The index patient is B.III.6. The clinically affected patients are marked in black. Deceased are B.II.3, B.III.3 and B.III.4. The c.659_661delAGA pathogenic variant in TNNT2 segregated with disease in the genotyped individuals. Family members who have not been genetically tested are labelled n.t—“not tested”.
