Distribution of markers across the PsA and PsC serum sets. Small-scale validation of ITGB5 (A) and POSTN (B) in PsA and PsC serum by ELISA. Dots represent serum samples from individual subjects; thin horizontal lines depict the mean, and vertical lines the standard deviation; FC represents the ratio of the mean concentration values corresponding to 33 PsA and 15 PsC serum samples. ** indicates P < 0.01; ns: non-significant. PsA, Psoriatic Arthritis; PsC, Cutaneous Psoriasis.