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Table 2 Gene copy number of total C4, C4A and C4B in SLE and controls

From: Impact of C4, C4A and C4B gene copy number variation in the susceptibility, phenotype and progression of systemic lupus erythematosus

C4 isotype Number of copies (mean ± SD)
Controls (n = 301) SLE (n = 427) p-value
Total C4 4.17 ± 0.83 3.87 ± 0.96 < 0.001
C4A 2.24 ± 0.73 2.06 ± 0.86 0.001
C4B 1.95 ± 0.71 1.87 ± 0.77 0.192