"There are three recognised forms of Niemann-Pick Disease, Niemann-Pick Type A, B and C. Niemann-Pick Type A and B are caused by an enzyme deficiency, causing a build up of toxic materials in the body's cells. Niemann-Pick Type C is not caused by an enzyme deficiency, but the end result is the same; an accumulation of materials (cholesterol and other fatty acids) in the body's cells." from http://www.niemannpick.org.uk/ .
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