Papillon Lefevre syndrome (report of two families).
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007645:Keratoderma, Palmoplantar / Q000235:genetics*; D008297:Male; D010214:Papillon-Lefevre Disease / Q000235:genetics* / Q000276:immunology; D011247:Pregnancy; D014429:Twins, Dizygotic