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A-C) Illustrate IFA patterns present among AE-IPF patients. All three AE-IPF patients whose plasma HEp-2 images are shown here (A-C) had negative assays for conventional clinical laboratory autoantibodies (see Online S1 Table in S1 File). Titrations here are 1:320 (A), 1:160 (B), and 1:80 (C). D) Negative IgG control.
