past studies of norepinephrine-stimulated protein phosphorylation in intact c-6 glioma cells had identified a 58,000 molecular weight , 5.7 isoelectric point protein ( 58k-5.7 ) as a cyclic amp-dependent phosphoprotein and had shown that 58k-5.7 was one of the most abundant proteins of the nuclear fraction .
C0033684
protein
C0031689
phosphoprotein