Pedigree of the family with a summary of the results. The observed alleles obtained from genomic DNA or from the RT-PCR products are shown as vertical lines, labeled with C, A, or G for the corresponding polymorphisms at codons 1241 and 1269 (nucleotides 3780 and 3864, respectively). A given allele that was present in DNA, but not observed in the RT-PCR product, is indicated by X.