using high-immunoreactivity somatomedin c tracer , we compared the performance of radioimmunoassays in which we used the tr4 antiserum and a well-characterized somatomedin c antiserum distributed by the national pituitary agency ( npa ) with that of the human placental-membrane somatomedin radioreceptor assay ( rra ) .
C1417830
tr4
C0086418
human