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Detection of CK8 (A), CK18 (B), and CK19 (C) autoantibodies by ELISA in serum samples from the four subject groups. Group I, patients with TDI-induced asthma; group II, asymptomatic exposed workers; group III, patients with allergic asthma; and group IV, healthy control subjects. Horizontal bars indicate positive cutoff values. The ANOVA and post hoc Scheffe test were applied to compare the level of specific IgG to CKs 8, 18, and 19 among the four study groups.
