synovial fluid ( sf ) from patients with osteoarthritis ( oa ) , rheumatoid arthritis ( ra ) , and various other arthridites was analyzed to assess the prevalence of interleukin-1 ( il-1 ) using both radioimmunoassay competitive inhibition specific for the beta form of il-1 and the d10.g4.1 cell line bioassay which measures both alpha and beta forms of il-1 .
C0021753
beta
C0021755
il-1