title: Hemophilia B Leyden: a sex-linked hereditary disorder that improves after puberty.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005164:Factor IX / Q000032:analysis; D008040:Genetic Linkage; D002836:Hemophilia B / Q000097:blood / Q000235:genetics*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011627:Puberty; D011863:Radioimmunoassay; D012730:Sex Chromosomes
chemical_list: D005164:Factor IX