| http://www.w3.org/ns/prov#value | - from a blood sample.When both parents are carriers, there is a 1 in 4, or 25%, chance, with each pregnancy, to have a child with SMA. Carrier testing for the general population is technically difficult and usually available only if a previously affected child in the family has been studied.What are the symptoms of spinal muscular atrophy?Spinal muscular atrophy is sometimes difficult to diagnose,
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