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Inhibition of serum IgG binding to sulphatide by serum amyloid P (SAP). Serum R9 (▪, □) was used at 1:1000, serum R139 (▴, ▵) at 1:100. Diluted sera and either SAP (▪, ▴) or C-reactive protein (CRP; □, ▵) were incubated together. Error bars show s.e.m.; n = 4–6 determinations for each value in the figure.
