phosphorylation of a protein ( or proteins ) of molecular weight 120,000 in the aplysia abdominal ganglion , as measured by incorporation of [ ( 32 ) p ] or [ ( 33 ) p ] sodium phosphate in vitro followed by separation of the phosphoproteins on sodium dodecyl sulfate-polyacrylamide gels , was specifically stimulated by incubation in the presence of the putative neurotransmitters octopamine or serotonin .
C0033684
proteins
C0031689
phosphoproteins