iodination using the mild oxidant n-bromosuccinimide , followed by extensive tracer purification to remove the unlabelled il-1 beta , produced a tracer with a specific activity of 89 microci/micrograms ( 0.83 atoms iodine/molecule il-1 ) which was fully displaced by unlabelled il-1 beta , allowing the development of a sensitive and specific radioimmunoassay for il-1 beta .
C0021755
il-1
C0021753
il-1 beta