one antibody population , of low abundance , had an affinity constant ( ka = 8.6 x 10 ( 10 ) l/mol ) 5.7 times that of the unfractionated antiserum and , when used in radioimmunoassay standard curves , resulted in a 3.8-fold increase in the sensitivity of the assay .
C0003241
antibody
C0020960
antiserum