the proteins tested in reconstitution mixtures were an acid-labile mr 84,000-86,000 glycoprotein doublet ( alpha subunit ) , an acid-stable mr 47,000-53,000 glycoprotein doublet with igf-binding activity ( bp-53 or beta subunit ) , and igf-i or igf-ii ( gamma subunit ) .
C0037657
igf
C0021665
igf-i