S100A9 and psoriasis: All other DEGPs could be placed along a continuum, with some showing greater psoriasis specificity (e.g., DBI, GLTP, HRNR, KRT73, ELOVL7), and others showing similar expression shifts in many or most skin diseases (e.g., MX1, S100A8, S100A9, STAT1, LAP3) (Fig. 5).