Fig. 1. A Chinese pedigree with X-linked retinitis pigmentosa.

Square symbols denote males; the circles denote females. The filled shapes indicate the affected individuals with RP, a dot in the middle of the circle indicates an asymptomatic carrier in the family and a dot in the middle of the circle with slant line inside indicates a symptomatic carrier. The arrow signifies the proband. The symbol △ denotes the individual who was both clinically examined and genotyped. The symbol * denotes the individual who was only genotyped. The symbol # denotes the individual who was not clinically examined and genotyped because of her very young age (2 years old).