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4 interesting facts of spinal muscular atrophy

User PRINCESS FLUFF
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Answer:

There are 4 main types of SMA (Types 1-4) that range in severity and when symptoms first appear. SMA can be fatal in some people and less severe in others. SMA Type 1 is the most common and is very serious. The fifth, and most severe, form of SMA is Type 0.

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User Weberste
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