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Gene Copy-Number Variation and Associated Polymorphisms of Complement Component C4 in Human Systemic Lupus Erythematosus (SLE): Low Copy Number Is a Risk Factor for and High Copy Number Is a Protective Factor against SLE Susceptibility in European Americans

Gene Copy-number VariationSle SusceptibilityAllelic VariantAutoimmune DiseaseLupusGeneticsMedicineImmunologyGenetic EpidemiologyHuman PolymorphismLow Copy NumberAutoimmunityMolecular GeneticsGenomicsMolecular DiagnosticsImmune-related Gene PolymorphismVariant Interpretation