Dr Chelisa Cardinez (IMAGE) Australian National University Caption Dr Chelisa Cardinez (pictured) says the discovery finally provides an explanation for why patients with psoriasis may go on to develop psoriatic arthritis, leaving them with joint pain, stiffness and swelling. Photo: Jamie Kidston/ANU Credit Credit: Jamie Kidston/ANU Usage Restrictions Must credit Jamie Kidston/ANU License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.