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Definition of Amyotrophic lateral sclerosis 4

Amyotrophic lateral sclerosis 4: ALS4. A juvenile-onset form of amyotrophic lateral sclerosis (ALS) with no bulbar involvement, inherited in an autosomal dominant manner and caused by mutation in a gene on chromosome 9q34.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=34051
Last Editorial Review: 6/14/2012

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