Figure 1.
GAD65Ab positivity correlated with competition binding to GAD65. All plasma samples from the GRADE Beta Cell Ancillary Study were re-analyzed for binding to GAD65. a, GAD65Ab indices obtained in the present analysis correlated with those reported previously [10]. The line for simple linear regression is shown together with R-value and P-value. b, GAD65Ab positivity was confirmed in a displacement assay using recombinant human GAD65 as a competitor. The cutoff for positivity (40% competition) is indicated by the dashed line. Samples that were subsequently analyzed for GAD65Ab epitopes are indicated by red dots.