title: Genetic analysis of subgroups within simplex and multiplex retinitis pigmentosa.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005808:Genes, Recessive; D006801:Humans; D012174:Retinitis Pigmentosa / Q000209:etiology / Q000235:genetics*; D012306:Risk