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Structures of autosomal recessive RTA kindreds in which linkage studies were performed. Affected and unaffected subjects are indicated by solid and open symbols, respectively. Dots indicate individuals unavailable for study. Double lines indicate parental consanguinity; all are first cousins except kindreds RTA23 and RTA24 who are second cousins. Genotypes at polymorphic loci closely flanking AE1 are shown.
