the assays include the quantification of keratan sulphate , hyaluronan and beta-d-xylosyltransferase in serum and pyridinolin in serum and urine as markers for cartilage catabolism , as well as the detection of autoantibodies to cartilage matrix and cell components and cartilage-directed t-cell reactions in the patients .
C0225371
cartilage matrix
C0007301
cartilage