The invention relates to the detection and identification of polymorphisms in cysteine dioxygenase (CDO) for the use of that diagnosis to identify a propensity in a patient towards rheumatoid arthritis and/or to have side effects with a number of drugs, to nucleic acid and isolated proteins encoding the polymorphisms, to assays for CDO activity and for the identification of compounds affecting CDO activity, and additionally to use of interferon-gamma optionally in combination with different compounds, to treat rheumatoid arthritis.
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