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Anti-pepC10 IgM (A) and IgG (B) in sera from 100 blood donors (BD), 80 patients with EM, 100 patients with NB, 30 patients with ACA, 30 patients with syphilis (SY), and 20 patients with mononucleosis (Epstein-Barr virus [EBV] infection). The horizontal lines mark the diagnostic cutoff levels for 98% specificity.
