Columbia subject headings:
Centrifugation, Density gradient.
Radioimmunoassay.
Zonal centrifuge.
Harvard subject headings:
Centrifugation, Density gradient.
Radioimmunoassay.
Zonal centrifuge.
Princeton subject headings:
Centrifugation, Density gradient.
Radioimmunoassay.
Zonal centrifuge.