The expression of C3c immunoreactivity in cryosections from a representative Köbner-positive patient with psoriasis on day 0 (a), day 1 (b), and day 7 (c).The immunohistochemical staining of CD11b+ cells in cryosections from a Köbner-positive patient with psoriasis on day 0 (d) and day 7 (e). The gene discussed is ITGAM; the disease is psoriasis.