Figure 1: Families 1–6 genealogy. Circle is the equivalent of the female sex, and square is the equivalent of the male sex. Each family member is described with the sample number, age at the time of the study, and the type and the subtype of the disease (for patients diagnosed with LQTS). Grey color indicates patient diagnosed with LQTS, and white color indicates healthy individuals. The question mark represents a person who was not examined.