Demonstration of c19orf10 in synovial fluids. Synovial fluid c19orf10 levels were determined by competitive enzyme-linked immunosorbent assay for five patients with the indicated arthropathies. Each fluid was measured at two different dilutions. The concentrations for each are indicated in the table. A representative standard curve is presented in the graph. c19orf10, chromosome 19 open reading frame 10; GST-orf10, glutathione S transferase-open reading frame 10; SF, synovial fluid.