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The assay for detecting anti-citrullinated type II collagen antibodies was performed in 55 serum samples from patients with osteoarthritis (OA) of the knee, 31 systemic lupus erythematosus (SLE) patients, 24 systemic sclerosis (SS) patients, 21 dermatomyositis/polymyositis (DM) patients, 21 ankylosing spondylitis (AS) patients, and 18 psoriatic arthritis (PA) patients. The transverse line shows the cutoff value
