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. 2017 Jul 28;4(1):e000225. doi: 10.1136/lupus-2017-000225

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Serum osteopontin (OPN) levels in population-based controls and in cases with SLE. Serum levels of OPN, determined by ELISA, were significantly higher among patients with SLE (mean 40.6 ng/mL) compared with controls (mean 10.1 ng/mL).