Fig. 1.

Anti-calpastatin antibody levels in patients with psoriasis. IgG or IgM anti-calpastatin antibody levels were determined by ELISA using human recombinant calpastatin domain I in patients with psoriasis vulgaris patients, those with psoriatic arthritis, those with generalized pustular psoriasis (GPP), those with RA and normal controls (CTL). The short bar indicates the mean value in each group. A broken line indicates the cut-off value (mean ± 2 s.d. of the control samples). Values in parenthesis represent the dilutions of pooled sera giving half-maximal OD values in ELISA, which were determined by linear regression analysis to generate arbitrary units per millilitre that could be directly compared between each group of patients and normal controls.