IL17A and psoriasis: In psoriasis, circulating exosomes isolated from patient plasma have been found to contain elevated levels of pro-inflammatory mediators such as IL-17A [89], miR-146a [90], miR-31-5p, miR-7-5p, miR-146a-3p, miR-944, miR-21-3p, miR-147b, miR-431-5p, miR-3614-5p, miR-223-5p [91], miR-625-3p, miR-4488, and miR-342-3p [92], compared to healthy controls.