preparations of the 180-kda phosphoprotein that are greater than 90 % homogeneous by silver stain and by [ 35s ] methionine protein autoradiography have specific high affinity 125i-labeled pdgf binding sites ( equilibrium dissociation constant , 0.1 x 10 ( -9 ) m ) .
C0031689
phosphoprotein
C0033684
protein