Arthritis, also known as inflammatory joint disease, is related to rheumatoid arthritis and psoriatic arthritis, and has symptoms including arthralgia, back pain and metatarsalgia. An important gene associated with Arthritis is SYK (Spleen Associated Tyrosine Kinase), and among its related pathways/superpathways are Innate Immune System and MIF Mediated Glucocorticoid Regulation. The drugs Nafcillin and Prednisolone have been mentioned in the context of this disorder. Affiliated tissues include bone and bone marrow, and related phenotypes are Decreased Tat-dependent HIV-LTR-beta-galactosidase protein expression and homeostasis/metabolism