incorporation of [ ( 3 ) h ] serine into heparan sulphate was not affected by dibutyryl cyclic amp , whereas the degree of substitution of serine residues with heparan sulphate chains was less in heparan sulphate synthesized in the presence of dibutyryl cyclic amp , suggesting that cyclic amp exerts its effect on the metabolism of sulphated glycosaminoglycans by affecting the transfer of xylose on to the protein core .
C0012054
dibutyryl cyclic amp
C0001455
cyclic amp