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The article cites a study, where biopsy material from patients with various types of psoriasis has been analyzed for the presence of deposits of immunoglobulin and complement by means of a direct immunofluorescence technique. Previously, little attention has been paid to the walls of the dermal vessels, where the majority of the deposits were found and are being discussed in this article. Several studies suggest that immunological factors may be of importance for the development of psoriatic lesions.