Main Page | See live article | Alphabetical index Hemophilia B (also spelt Hæmophilia B or Haemophilia B) is a blood clotting disorder caused by a mutation of the Factor IX gene. See haemophilia. External Link http://www.yourgenesyourhealth.org/ygyh/mason/ygyh.html?syndrome=hemo§ion=whatisit&video=0 This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.