Fig. 1From: Impact of C4, C4A and C4B gene copy number variation in the susceptibility, phenotype and progression of systemic lupus erythematosusDistributions of gene copy number (GCN) for total C4, C4A and C4B in healthy controls and systemic lupus erythematosus patients. GCN for total C4 (a), C4A (b) and C4B (c) was determined in 427 patients with systemic lupus erythematosus (SLE) and 301 healthy controls by quantitative real time PCRBack to article page