Letter: Genetics of duodenal ulcer.
D000017:ABO Blood-Group System; D004381:Duodenal Ulcer / Q000235:genetics*; D004386:Duodenum / Q000378:metabolism; D005643:Fucose; D006023:Glycoproteins / Q000032:analysis; D006801:Humans; D009093:Mucus / Q000032:analysis*
D000017:ABO Blood-Group System; D006023:Glycoproteins; D005643:Fucose