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Spinal muscular atrophy

Spinal Muscular Atrophy (SMA) is a term applied to a number of different disorders, all having in common a genetic cause and the manifestation of weakness due to loss of the motor neurons of the spinal cord and brainstem.

The most common form of SMA is caused by mutation of the SMN gene, and manifests over a wide range of severity affecting infants through adults.

Note: This article excerpts material from the Wikipedia article "Spinal muscular atrophy", which is released under the GNU Free Documentation License.

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