Fig 4. Antibodies directed against the Klebsiella pneumoniae-derived DPP121-145 peptide in the sera of patients with inflammatory arthritides.
(A) The results of an assay of europium-labeled antihuman IgG antibodies are shown; each circle represents a measurement for one patient, and the dashed horizontal line indicates the cut-off value of 32,250 international units. ROC curves showing sensitivity and specificity of the assay of IgG antibodies against the Klebsiella pneumoniae-derived DPP121-145 peptide for differentiating between AS sera and l healthy donors (B), between AS samples and RA (C) and between AS sera and PsA samples (D).