 - AIN457 is a protein developed by NOVARTIS that is used to stop the action of Interleukin-17 IL-17, a protein made by the body that contributes to many different kinds of inflammatory diseases, including Crohns disease. AIN457 is being developed for the potential treatment of various inflammatory diseases like rheumatoid arthritis and psoriasis, but has not been tested for suitability in people with Crohns disease. 