Figure 1. Family structure and haplotype analysis of two Chinese families with retinitis pigmentosa. Pedigree and haplotype analysis of family RP24 showed “loss of heterozygous” segregation with single nucleotide polymorphism (SNP) rs3760698 (red x). #, 1 indicates the wild-type allele; 2 represents the mutant allele. All markers and SNPs are located on chromosome 19, listed in descending order from the centromeric end.