A, Pedigree of family P13, with sequence corresponding to the proline→leucine mutation (left to right): unrelated control individual, mother (II:1), index patient (III:2), and brother of the index patient (III:1). For the potentially affected female cousin (individual III-4) (indicated with an asterisk [*]), no clinical data are available. Affected nucleotides are indicated with black arrows. B, Pedigree for family P42, with sequence chromatograms indicating the splice-site mutation in affected individuals (left to right): father (I:1), mother (I:2), index patient (II:1), and mildly affected sister (II:2). Uppercase letters indicate coding sequence; affected nucleotides are indicated with black arrows.