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U1 snRNA Gene Mutation
A change in the nucleotide sequence of the U1 snRNA gene. [from NCI]
Anti-U1 ribonucleoprotein antibody positivity
The presence autoantibodies in the serum that react to proteins (70 Kd, A, C) that are associated with U1 RNA and form U1snRNP. [from HPO]
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